Quadruple meter | A meter of four beats to a measure.
Quadruple stop | The sound of four strings played at once on a violin or similar stringed instrument.
Quadruplet | A group of four notes to be performed in the time of three or six (indicated by a bracket and the number 4).
Quarter note | A note with one-fourth the duration of a whole note, or half the duration of a half note; a basic note value in music; often used to indicate the beat. (Also crotchet.)
Quarter rest | A rest with one-fourth the duration of a whole rest, or half the duration of a quarter rest. (Also crotchet rest.)
Quarter tone | A microtonal interval of half a semitone.
Quartet | A group of four musicians. Also a composition written for four voices or instruments.
Quaver | (See eighth note.)
Quaver rest | (See eighth rest.)
Quintet | A group of five musicians. Also a composition written for five voices or instruments.
Quotation | A short musical passage taken from one piece of music and used in another. (See also sampling.)