You're probably thinking you've heard every imaginable variation on every single Super Mario theme, jingle and ditty, but this Super Mario World overworld theme contains a marimba and a melodica. It's also pretty good.
The list of instruments in Adam Mormolstein's video might even eclipse the number of levels in Mario's 16-bit opus, but we could be wrong as we don't know what some of the instruments are. They look good, though.
Thanks to Jason for sending this in.