So I've probably mentioned before, but a friend of mine is really into the utaite/youtaite (cover singer) scene on youtube!
The one thing I love about utaite are the awesome tournaments and competitions (as either solo or groups)to compete against other utaite, not just by singing covers, but also creating artwork and animation to go with it.
Some of my favourites atm:
My friend's in a group called
Callipygian Tale Biran no Kaze from Donten Ni Warau
BACK ON「wimp ft. Lil' Fang (from FAKY) 」 from Gundam Build Fighters covered by Serve Aces
弱虫な炎 from Yowapedal covered by Hook Up Time
Rising Hope from Mahouka koukou no Rettousei covered byONE TRACK NOISE
The Beginning by One Ok Rock covered by RE:CHORD
RESISTANCE covered by Raw Squid Foam
Just a few from the top of my head xD