Retro Shooter with generated content4.09 / 5.00 1,532 Views
Blow the enemy to hell or die a hero! Do you have the Expendaballs for combat, Soldier?3.90 / 5.00 9,643 Views
It's time to escape the city!3.84 / 5.00 2,645 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.