idioms using musical instruments

Fiddle with

To play around with, adjust

“The database crashed because someone fiddled with the settings.”

Trumpet

To feature, to brag

“Our design won "best of show" so we need to trumpet that in our ad campaign.”

Drum up

To generate

“Kanazawa-san is trying to drum up interest in a weekend skiing trip.”

Harp on

To complain

“Miyaki-san was harping on me about being late to work so I promised to be on time from now on.”

As fit as a fiddle

Physically fit

“Ozawa-san is 65 but she is as fit as a fiddle.”