noun
cassette
kuh-SET/kəˈset/
A removable case that holds material for use in a device, especially magnetic recording tape.
The cassette's clear windows reveal two reels of magnetic tape.

Etymology
A cassette was originally a “little box.” The recording sense applies that name to the small protective case holding magnetic tape, rather than to the tape alone.
In context
then the drummer forgets how to play it and then you're trying to record it on a cassette tape.