Time Signature
A symbol placed at the left side of the staff indicating the meter of the composition. For example, a time signature of 3/4 would indicate that there are three quarter notes in each measure and the quarter notes receive the main pulse (or beat).
Composition
1. Any musical work or production.
2. The act of compiling and inventing a piece of music.
Triple Meter
A metrical pattern having three beats to a measure.
Quarter Note
A note having the time duration of one fourth of the time duration of a whole note.
Measure
American term, equivalent to the English term "bar", signifying the smallest metrical divisions of a composition, containing a fixed number of beats, marked off by vertical lines on the staff.
Beat
The regular pulse of music which may be dictated by the rise or fall of the hand or baton of the conductor. by a metronome, or by the accents in music. See conducting patterns.