Shoot swords, teleport and don't mess with the turtles3.93 / 5.00 8,882 Views
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Jump through a bustling cat city collecting fish for points.3.46 / 5.00 1,676 Views
Though if you DON'T plan on submitting it to Newgrounds, I would just suggest googling "song name a cappella". There are dozens of sites out there that have it done for you.
If you really want to do it yourself, I'd suggest watching this video and inverting it so that you have just the vocal and not the instrumental.