music - an artistic form of auditory communication incorporating instrumental or vocal tones in a structured and continuous manner

musical time - the beat of musical rhythm

accelerando - a gradually increasing tempo of music; "my ear will not accept such violent accelerandos"

allegretto - a quicker tempo than andante but not as fast as allegro

allegro - a brisk and lively tempo

andante - a moderately slow tempo (a walking pace)

meno mosso - played at reduced speed; less rapid

rubato - a flexible tempo; not strictly on the beat

rate - a magnitude or frequency relative to a time unit; "they traveled at a rate of 55 miles per hour"; "the rate of change was faster than expected"