This, played it on stage at age of 6.
Main has been bass, but it's more guitar which has improved over past years. (Not gigging standard, mainly rythm, but can layer a decent solo plying sections the glue together in DAW). As @AndyTravis mentioned keyboard, it' s more or less to operate Vst instruments and synth, some piano (very simple stuff). Used to play drums quite well 30 years ago. A bit of Jews harp (used it in the BC composition last year or so).
Do microphone and comb kazoo count?
how about air bass, air drum or air guitar?