The answers to these questions can easily be found via Google, but there’s no need to look because it doesn’t matter. The marimba is not a guitar or drums or bass or even vocals. Aside from band camps and Interlochen, the thing barely exists.
The marimba is what happens when as a kid you beat on your ‘Lincoln Logs’ with your sister’s Barbie dolls. A crazy idea until some nipple decided that it would make a decent instrument.
But every instrument, no matter how lame, can find its redemption in a most faithful and reliable manner: The NES game theme.
Marimba + Legend Of Zelda = WIN