After an outburst at the funeral for Homer's dead Vegas wife, Marge takes Bart to a shrink who prescribes playing the drums over Ritalin. Bart quickly upstages Lisa at a jazz jam and is recruited into a respected trio. A dejected Lisa turns her back on music and pours her heart into rescuing animals from the local pound. Lisa is able to keep her menagerie a secret until a pet tiger attacks her brother. Bart organizes a benefit concert to have his mangled drumming arm operation but has a last minute change of heart and donates the proceeds to an animal shelter in his sister's name.