Staff:The horizontal lines on and between which notes are written or printed: the placement of a note on the staff indicates its pitch. Time Signature: a sign consisting of one number over another, esp. after the key signature, indicating the unit of measurement and the number of beats in the following measure or measures (Ex.: 3/4 means three quarter-note beats); also, a nonnumerical sign used in this way (Ex.: C is often used instead of 4/4)
Measure:the notes or rests, or both, contained between two vertical lines on the staff; bar.
Bar: a vertical line across a staff, dividing it into measures.
Quarter Note: a note having one fourth the duration of a whole note.