Sunshine - VS. Sonic.exe (Tails Doll's Song)
Not to be confused with sunshine from the bob mod. Seriously though, this song is awesome. I love the doll's voice as well as the AMAZING 3D SPRITES! As well as the part where the screen goes dark, god its just too cool.
66-06 in the sound test menu to unlock.
Play the mod at https://gamebanana.com/mods/316022