I'm choosing Frankie and my suggestions are:

Stay with Me by the Faces or
Sexual Healing by Marvin Gaye.

He would slaughter them both, but It'd be funny to watch.

Johnny.

Dude looks like a lady.

Craig

The Biscuit Rap from two pints of lager

I think I'd do Frankie as well,

Bleeding Love by Leona Lewis, but his would be a remix called Bleeding Ears.
Or maybe Cher Lloyd's Swagger Jagger!

I'd really like to see him fail doing Bleeding Love, I think Swagger Jagger would be interesting to say the least .

Frankie - Who Wants To Live Forever
Misha - Wooly Bully
Craig - Food Glorious Food

Frankie - a cover of Ivor Biggun's hit - I'm a w......

Kitty - Crazy by Gnarls Barkley

Derry - 'I fought the law and the law won'

The Risk - Ebony and Ivory

Frankie - Creep
Kitty - I'm a B**** (I don't think she's one btw)
The Risk - Grow A Girl from Katy Brand (change Girl to Boy)

Louis - YMCA

The Risk - Changes (2Pac/David Bowie)
Frankie - I touch myself
Misha B - Fighter
Craig - Pour some sugar on me (loose biscuit love reference!!)

frankie- like a virgin

Marcus - I kissed a girl - Katy Perry

Frankie - 'I'm Too Sexy' by Right Said Fred.

Or 'Mr Loverman' by Shabba Ranks.

Johnny - Man i feel like a woman

that would be soo funny and would love to see the judges comments like if he captured the meaning of the song/ or you meant every word you sang/ i believed everything

He should do that in his Sara Lee get-up, would be hilarious

Kitty - 'Black or White'

.
Frankie 'Go now'

Frankie - Sleazy by Ke$ha
Misha - B**** by Meredith Brooks
Kitty - White Riot by The Clash

I was going to suggest, I'm too sexy, for Johnny.
He could really ham it up

Frankie - These Girls Fall Like Dominoes

Frankie - Im no good

Little Mix can sing this and dedicate it to Frankie...

http://www.youtube.com/watch?v=1Tl-c_puzbM

Frankie - Hit Me with Your Rhythm Stick - Ian Dury & The Blockheads
Janet - Boring - Pink
Kitty - The Lady is a Tramp - Frank Sinatra/Ella Fitzgerald/Shirley Bassey
The Risk - Smooth Criminal - Michael Jackson
Craig - Deadlines and Diets - Girls Aloud
Marcus - The Wonder of You - Elvis Presley
Little Mix - Swing When You're Winning - Robbie Williams
Misha - Diva - Beyoncé
Johnny - Money For Nothing - Dire Straits

Got a bit stuck with Marcus. Used that because he seems to like a bit of Stevie lol