I bought the Wii U at launch, and IIRC, you could always use the Wii U Pro controller to turn on the system, select a game. Left analogue stick gives you a cursor; if the WaraWara Plaza [Mii Plaza] is on TV screen, X to switch. Unfortunately mine mostly collects dust, as I'm a PC gamer at heart, but I wouldn't trade it for a PS4/XB1.

Haha, you're adorable! Thinking you own hardware (or software) that you paid for...

Sure you can listen to a MID/MIDI of a symphony from Mozart, and it'll never sound like an actual live concert band playing it, just like a robot won't sound like an actual concert band.