ront.com/dota+rick+rollrar/;11560244;/fileinfo.html
Just a bit of caution, if you DL this map, you'll see some cubes when you play the game. So you can still rick roll people with it, but if you don't want the cubes after that, just delete the map or system restore. Anyways, have fun with it! :)
Btw if you're having trouble with the music, try pressing Ctrl+m (thanks STICKRAZUL for pointing that out!)
We made a near-exact replica of DotA v6.54b except changed the version to v6.54c and photoshopped the minimap preview. Much lulz ensued.