Went through the X factor vids to try remember who's done what :P
Ones I like in bold
Boys
Duane Lamonte
Joseph McElderry
Lloyd Daniels
Rikki Loney [Although I prefered him last year]
Girls
Stacey Solomon
Rozelle Phillip
Lucie Jones
Jade Fubara
Shanna Goodhead
Overs
Danyl Johnson
Behrouz Ghaemi
Jamie Archer
Daryl Markham
William Hooper
Olly Murs
Groups
John & Edward
Miss Fitz