(YouTube Link)
YouTube user daniscool99 made this a cappella version of the Pokémon theme song. I was a bit skeptical that it was truly without accompaniment, but he insists:
*ALL SOUNDS ON THIS RECORDING WERE MADE VOCALLY*
-The drum shots were transcribed and recorded shot for shot
A lot of different effects have been used on this recording. Pitch correction, yes pitch correction, was used on lots of the backup tracks - although none on the lead vocals. While I didn't necessarily care to "correct wrong pitches", I used to create a continuity and consistency of sound because I was imitating instruments. The guitar sounds have distortion and tape delays and everything has significant EQ's as well... The drums are a prime example. Also some use of pitch shifting.. no I can't sing that low lol.
In that case, this was very impressive work.
via Albotas