Hello, and welcome to today's music lesson.

I'm Ms. Mansell, and I'm gonna be your teacher today.

Let's get started.

Today's lesson outcome is I can analyze how a piano trio uses complex textures to develop ideas and create variety, and I can incorporate some of those into my own composition.

Let's look at some keywords for today.

Polyphony, a texture involving more than one equally important melodic line.

Imitation, when a short part of a melody is copied or imitated in another part.

Antiphony, where two or more instruments or groups have dialogue, similar to call and response.

Doubling, where a second part plays a melody in unison with another part.

Harmonization, where a second part plays the main melody with different notes, creating harmony.

Today's lesson on interaction between parts is in two sections.

Section one is analyzing a piano trio, and section two is interaction between parts in your composition.

Let's get started with analyzing a piano trio.

Although a piano trio is a relatively small ensemble, it creates many opportunities for interesting interaction between parts.

When it became most popular in the Romantic period, composers exploited the versatility of the piano to create varied compositions that explored the interaction of the piano, violin and cello.

Have a listen to this piano trio.

Can you identify some of the different ways that the three instruments interact?

Have a listen.

The first thing you might notice is that the melody is shared between all three instruments, and each instrument plays the accompaniments in sections as well.

This creates varied interaction between the parts, keeping the composition interesting for the listeners and the performers.

Have a listen to this short clip.

Which instrument is playing the accompaniment here?

Did you recognize the violin?

It's playing the accompanying broken chords, creating variety by allowing the cello and piano to play the melody together.

One common technique in piano trios is to use doubling of melodies.

This is where the main melody is played in unison in two or more parts, adding emphasis and energy to the melody.

Compare these examples.

When we first hear the melody, it is played by the violin with piano accompaniment.

Have a listen When it develops later on, the composer doubles sections of the melody in the piano and cello.

This creates a thicker texture and more intense mood.

Have a listen, and you can see it highlighted on the score.

The piano also doubles melodies by playing them in octaves.

This adds intensity and energy to the original melody.

Have a listen, and again, you can see it highlighted on the score.

In this example, you might have noticed that the violin also joins in to double the melody for the final phrase.

In many cases, instead of doubling, which is in unison, the composer uses parts to harmonize the main melody.

In this example, the cello plays the main melody.

The piano uses a similar rhythm and melodic shape, but harmonizes the melody by using different notes, in this case, a 6th above the main melody.

Have a listen to this section.

This adds harmonic interest, developing the original melody.

After a few bars, the violin takes over from the piano harmonizing the cello melody.

Have a listen.

In this short section, the composer has created a variety of different interactions between the parts by using harmonization.

Let's do a check for understanding.

Which statement is true about doubling a melody?

Is it A, doubling uses the same pitch in rhythm as the melody, B, doubling uses the same pitch but different rhythm to the melody, or C, doubling can only involve two parts?

Have a think.

Is it A, B or C?

Well done if you said A, doubling uses the same pitch and rhythm as the melody.

Which statement is true about harmonization?

Is it A, harmonizing must use more than two parts, B, harmonizing must use different rhythms to the melody, or C, harmonizing must use different pitches to the melody?

Have a think.

Well done if you said C.

Harmonizing must use different pitches to the melody.

There are many examples in this piano trio of imitation.

This is where one part copies or imitates a short section of a melody from another part.

Have a listen to this example.

Can you identify which instrument is imitated here?

In this section, the piano in the left hand played a short melody that is imitated in turn by the violin, piano right hand and cello.

Taking a short part of a melody and creating an imitative texture between the parts is a particularly effective way of developing melodic ideas.

Can you hear which two parts use imitation in this example?

So have a listen.

And hopefully you could hear that the violin imitates the piano melody.

In some cases, the composer uses a long section of melody to create a polyphonic texture.

In this example, each part plays the four bar melody starting at different times on different notes.

Have a listen.

Because the three melodies are equally important, this is a polyphonic texture.

Polyphonic textures like this are often used in piano trios During the development section, the contrasting middle section where the composer develops the original melodic ideas.

In the development section of this piano trio, the composer also uses a short section of antiphony, where two groups or parts interact in a call and response dialogue.

This is different from imitation because the two melodic ideas are not the same as each other.

Can you identify the section of antiphony in this clip?

Which instrument or instruments are playing the response in the call and response?

Have a listen to the clip.

I hope you could hear the call in the piano and then the response in the violin and cello.

And here.

In summary, this piano trio demonstrates a variety of different interactions between the parts.

These include sharing the melody between all three parts, sharing the accompaniment between all three parts, doubling melodies, harmonizing melodies, using imitation, creating a polyphonic texture and using antiphony.

By using these techniques, the composer has created a varied composition in which the instruments interact in numerous ways.

Let's do a quick check for understanding.

What is antiphony?

Is it A, when multiple equally important melodies play at the same time, B, when a short part of a melody is copied in another part, or C, where two or more instruments or groups have dialogue?

Have a think.

Is it A, B or C?

Well done if you said C.

Antiphony is where two or more instruments or groups have dialogue.

A is describing polyphony and B is describing imitation.

So let's do task A.

Have a listen to the whole piano trio.

Write a paragraph explaining how the instruments interact in different ways.

So pause and have a listen to the piano trio and write your paragraph.

For your paragraph, you might have mentioned sharing the melody between all three parts, sharing the accompaniment between all three parts, doubling melodies, harmonizing melodies, using invitation, creating a polyphonic texture or using antiphony.

Let's move on to the second section, interaction between parts in your composition.

This composition shows us some specific techniques for creating interaction between parts.

These include sharing the melody between parts, sharing the accompaniment between parts, doubling melodies, harmonizing melodies, using imitation, creating a polyphonic texture and using antiphony.

Genres and styles all have typical ways that parts interact.

It's important to understand these so that you can compose idiomatically.

Classical styles will often use some or all of the techniques explored in this lesson.

In pop and rock styles, songwriters often use doubling and harmonization, and sometimes they use imitation, antiphony, call and response, or sharing of melodies between parts.

Which type of interaction between parts is least common in pop and rock styles?

Pause and have a think.

Well done if you said creating a polyphonic texture.

So let's do task B.

Reflect on your composition.

Identify where you could create interaction between parts to add variety, musical interest and to develop your ideas.

Make sure you consider what is idiomatic in your chosen style.

Consider sharing the melody and accompaniment between different parts, using polyphony, imitation, antiphony, doubling and harmonization.

And develop your composition using your chosen techniques.

So pause the lesson video now and have a go at developing your composition.

Reflect on the changes you have made to your composition.

Use these questions to help you consider your next steps.

How do composers in the style typically create interaction between parts?

How do the different parts interact in your composition?

Are there any further opportunities to use imitation, antiphony or polyphony?

Could you harmonize or double a melody to add variety?

Are the melody and accompaniment shared between different parts?

Let's summarize today's lesson.

Considering the interaction between parts is an important part of composing.

In the Romantic piano trio, the composer shared both the melody and accompaniment between the three instruments.

They also used polyphony, antiphony, imitation, doubling and harmonization to create a varied composition.

Every style has idiomatic techniques for creating interaction between parts.

Thanks for joining me for today's lesson.