triplet - Three notes of equal length that are to be performed in the duration of
two notes of equal length.

time signature - A symbol placed at the left side of the staff indicating the meter
of the composition.

snare drum - A drum common in orchestral, band, and jazz music with two drum heads.
It is named after the "snares" or strings stretched across the lower drum head.

sixteenth note - A note having the time duration of one sixteenth of the time
duration of a whole note.

rests - A symbol standing for a measured break in the sound with a defined
duration.

quarter note - A note having the time duration of one fourth of the time duration
of a whole note.

polyrhythm - The use of several patterns or meters simultaneously, a technique used
in 20th century compositions.

kick drum - A pedal operated bass drum usually found as part of a drum kit (drum
set) played by a single musician in a rock, jazz, or other popular style ensemble.

half note - A note that has half the duration of a whole note.

eighth note - A note having the time duration of one eighth of the time duration of
a whole note.

drum kit - A drummer in a rock or jazz band usually plays a "kit" (sometimes
referred to as a drum set) or a specific group of untuned percussion instruments.

cymbal - A percussion instrument made of a circular brass plate.