rhythmist

[ rith-mist ]
/ ˈrɪð mɪst /

noun

a person versed in or having a fine sense of rhythm.
a person who uses rhythm, especially in a skilled way: a film editor who is a good rhythmist.

Origin of rhythmist

First recorded in 1860–65; rhythm + -ist

British Dictionary definitions for rhythmist

rhythmist
/ (ˈrɪðmɪst) /

noun

rare a person who has a good sense of rhythm