Orchestra:
Accordian:
One Guitar:
Two Guitars:
11-String Bass:
Contrabassoon:
Balalaika (Russian folk guitar):
Alto sax:
Ball-point Pen:
Beer Bottles:
Beatboxing Flute:
Ruler:
Tesla Coil:
Update: I had posted the wrong video for Beatboxing Flute. The video is fixed and I added 9 more videos. (New videos taken from here and here)
All stolen from the Neatorama blog post about fun facts about Mario:
