Cello and Viola
Strings
Timing or speed of the music.
What is Tempo?
Drums and Triangle
Percussion
A set of two numbers, one on top of the other one, written right after the key signature in a piece of music.
4/4
What is Time Signature?
Bassoon and Saxophone
Woodwinds
Standard pattern in measure or bar.
What is Beat?
Organ and piano
Keyboards
Alto, bass, tenor, and treble.
What is Clef?
Tuba and Trumpet
Brass
A a set of sharp (♯), flat (♭), and rarely, natural (♮) symbols placed together on the staff.
What is Key Signature?