As far as i can remember:

• Alesana (Met),
• All Time Low x3 (Met),
• Alex Gaskarth DJ Set,
• Action Item (Met),
• Aggro Santos,
• Alt Track (Met),
• August Burns Red,
• Blitz Kids,
• Bayside,
• The Blackout x2 (Met x2),
• Boys Like Girls x2 (Met),
• Breathe Carolina x2 (Met),
• Busted,
• Bullet For My Valentine,
• Billy Talent,
• Cash Cash,
• Charlie Simpson,
• Cobra Starship,
• Calvin Harris,
• Does It Offend You, Yeah? (Met+Guestlist),
• The Days,
• Decade (Met),
• A Day To Remember (x2),
• Dizzee Rascal,
• Dinosaur Pile-Up,
• D.R.U.G.S,
• Ndubz,
• Elliot Minor x4 (Met+Guestlist),
• Example x2,
• Every Avenue,
• Enter Shikari x4 (Album Launch Show!),
• Follow You Home,
• Fall Out Boy (Met),
• Feed Me,
• Four Year Strong,
• Foo Fighters,
• Fightstar,
• Furthest Drive Home x2,
• Funeral For A Friend,
• Framing Hanley,
• Fighting With Wire,
• Francesqa,
• Forever The Sickest Kids,
• Gym Class Heroes x2 (Met),
• Gabe Saporta (DJ Set),
• Glamour Of The Kill (Met),
• Good Charlotte,
• Hadouken! x4,
• Hellogoodbye,
• Hey Monday,
• Henry Homesweet x2 (I would usually just say that i met the artist here but i have to add that we went for dinner with everyone and it was the best day ever.),
• Hollywood Undead (Left early cause they sucked),
• HarleyLikesMusic (Met),
• Justice,
• JLS (x2)
• JEDWARD LOL,
• Kaiser Chiefs,
• Kids In Glass Houses x2 (Met),
• Kill Hannah (Met),
• Koan Sound,
• Knife Party,
• Killa Kela (Met),
• The LaFontaines,
• Lucy Spraggan (Met),
• Lower Than Atlantis,
• [ME] x5,
• The Maine x3 (Met),
• Mayday Parade,
• Metro Station x2,
• Me vs Hero x2 (Met),
• The Midnight Beast x2 (Met),
• McFly x2 (Met),
• Muse,
• My Passion x3 (Met),
• NeverShoutNever (Met),
• One Direction,
• Olly Murs,
• Paramore,
• Pendulum,
• Pure Love,
• Pierce The Veil,
• Panic! At The Disco x4,
• Red Jumpsuit Apparatus,
• Rou Reynolds (DJ Set),
• Shayne Ward (Met),
• Sean Smith (DJ Set - He has another name for this, right? drtylve or something),
• S Club 7 ;),
• Skrillex,
• A Skylit Drive,
• Stay The Night,
• Sub Focus,
• Straight Lines,
• Story Of The Year,
• Street Drum Corps,
• Summerlin (Met),
• Spy Catcher,
• Tom Deacon,
• Tek-One x2 (Met),
• Tinchy Stryder x2,
• Tonight Is Goodbye,
• Twin Atlantic x5 (Spoke to Sam on the phone, he loves me;) JELLY?!),
• Tyler Mae,
• Unicorn Kid x2 (Met),
• The Used,
• We Are The Ocean x2 (Met),
• We Are The In Crowd (Met),
• The Wanted, 
• The Wonder Years,
• The Xcerts x3,
• You Me At Six,
• Young Guns,
• Your Demise,
• 30 Seconds To Mars.

A crap load of local bands, too.

Coming up:

• Twin Atlantic Manchester,
• Knife Party w/ Koan Sound, Feed Me, Sub Focus and a few more.

BY THE WAY; This is for me to personally keep track but feel free to read :) It’s like my own personal fangirl page. ;’D