Let the credits roll... it's the Staff Roll theme from Super Mario 64!
When it comes to Staff Roll songs, there are a few great ones out there, but it's hard to find one as memorable as Super Mario 64's. While a lot of Staff Roll themes have the large, culminating orchestra feel, SM64's Staff Roll is simple and catchy.
Hearing this song brings back memories of playing Super Mario 64 for the first time and thinking of how awesome it was (for many of us it was one of the first '3D' games we played), and being a stupid kid and trying out those absurd 'how to get luigi' cheat codes. I never did get Luigi.
Hard to go wrong with the SM64 soundtrack, we'll come back again sometime!