Rate or pace (5)
I believe the answer is:
tempo
I believe this is a double definition.
'rate' is the first definition.
(musical rhythm or rate)
'pace' is the second definition.
(synonyms)
(Other definitions for tempo that I've seen before include "Speed of 3A" , "Speed at which piece of music is played" , "Rhythm of piece of music" , "Metronome output" , "musical quality?" .)