Pianists began abandon stride-influenced playing partly because the recently established allowed for time keeping to be done on that instrument instead of the left hand of the piano.

Unrelenting walking bassline

Explanation: Pianists began abandon stride-influenced playing partly because the recently established unrelenting walking bassline allowed for time keeping to be done on that instrument instead of the left hand of the piano.

tbh, either pop or, i know it's not on the list, but indie/ alternative.