I will ne honest this sounds a lot like Sans's overworld theme in the pacifist route and i cant unthink it now.

Speed of Rainbow (Wii Rainbow Road x Speed of Sound)

hey! follow me on my tumblr :D!
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Pause Screen - Banjo - Kazooie

Here’s a little something I made earlier on today & thought why not share it with the world. Hope ya’ll like share & enjoy

The song you hear on the radio in Portal 2.