What is a plane?

a.
a dimensioned hole
b.
a space between two intersecting lines
c.
a type of sectional view
d.
a flat surface

Nstrumental music that supports the main part(s) chamber music 2. a large group of instruments usually including woodwinds, brass, and percussion band 3. music written for small ensembles for an intimate setting accompaniment 4. a person who leads an ensemble conductor 5. an electronic keyboard capable of multiple instrument sounds