Ok. Last 2 updated, dunno001 with 3 and c0rd with 6.
And the answers:
Song 1 - From Kirby: Super Star. Its a pretty known piece. Also used in some random youtube videos (usually from niconico or whatever)
Song 2 - A game I never played. One day, I went over to my friends place and to do this day this tune still rings in my head. Punch Out!! Wii
Song 3 - Emerald Coast theme from Sonic Adventure
Song 4 - Ok, this was the "hard" one. Well, a lot got it anyway. Another game I personally never played, but this piece was quite memorable. Viewtiful Joe, Viewtiful Joe and Tatsunoko vs Capcom are all correct answers.
Song 5 - Falcon punch, anyone? F-Zero or Super Smash Bros. Brawl (maybe Melee too? Too lazy to check)
Song 6 - I used a Tales song in every round so far, so why not 
Tales of Vesperia
Song 7 - A PC FPS that I used to play. Battlefield 1942. It also appears in Battlefield 1943 and Battlefield 2... I think?
Song 8 - Seriously? Super Mario Galaxy...
Song 9 - LittleBigPlanet!
Song 10 - I guess you could say this was for all those JRPG fans (since VGC has a lot of them). Chrono Cross
"And yet, I've realized that maybe living a "decent" life means you won't ever have a "good" life."
