5ad3e94c_do_DS__and_all_things_Nintendo__Description
[Instrument] Accordion [Type] 31Trumpet Type [Description] 
This instrument is quite a handful, and player must squeeze it like a bellows while pressing keys and buttons on its sides. You'll need only to press buttons!
List of instruments in Wii Music - The Nintendo Wiki - Wii, Nintendo DS, and all things Nintendo
Description