I'm always singing to my rats, and I adjust the lyrics to include their names. Many seem to enjoy it, often lying motionless with eyes closed or bruxing. A lively or silly tune has even made some young 'uns run around in excitement. But if I sing something loud & serious I more often get a thumbs down - the critters disappear into pods or nest boxes. I've long figured that rats have an "ear" for music, perhaps because rats (and mice) communicate with each other using ultrasonic vocalizations.
https://www.the-scientist.com/features/researchers-study-rodent-songs-they-cant-hear-31942
My beasties also tolerate soft piano-playing quiet well, but they recoil from anything thunderous...especially hammering on the drum kit.