Ballet
A theatrical dance
Bi-Tonal
The use of two key signatures at the same time
Church Modes
Seven diatonic scales that are comprised of different arrangement of whole steps and half steps
Counterpoint
The use of two or more melodic lines
Duet
A piece written for two performers
Oratorio
A sacred theatrical drama that is sung, but performed without action, costumes, or scenery
Trio
A piece written for three performers