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A numbered musical piece might be called a concerto, an opus, or a composition. It could also be called a symphony.
Study
They can vary. They can either be called:ConcertoOrIntroduction and allegro
One of two: 1) A Quartet 2) A Piano Trio
A key signature
A group of Musical Instruments is called a consort.
Psalm.
It's called an etude - i.e. A musical composition written solely to improve technique.
A numbered musical piece might be called a concerto, an opus, or a composition. It could also be called a symphony.
Study
instrumental
I think it is a motive.
Basso continuo
Two singers are a duo.They might sing a duet, a musical composition for two performers.
They can vary. They can either be called:ConcertoOrIntroduction and allegro
One of two: 1) A Quartet 2) A Piano Trio
A key signature