I am guessing they will have a judges choice, motown (TBC) and either a previous song they have sung or a personal choice:

Amelia: papa was a rolling stone (motown)
Amelia: Price tag (Amelias choice...she sings it on youtube very well)
Amelia: 3rd song poss options: Alone- Heart, Come Together-Beatles, I Don't Wanna Miss a Thing-Aerosmith, Who Knew-Pink

Little Mix-Dancing in the street (Motown)
Little Mix-Push the Button OR About You Now-Sugababes
Lttle Mix-Previous song?

Misha B-I'm Every Woman (Chaka Khan)

Marcus-Easy (motown)

Sorry struggling for Misha and Marcus on the others

They won't be doing 3 songs.

Amelia.- Papa was a Rolling Stone/Tracks of my tears (Motown), Alone (Heart)/Just like a Pill (P!nk)
Marcus.- Get Ready/Living for the city (Motown), Against all odds (Phil Collins)
Little Mix.- End of the Road/I'll be there (Motown), Survivor (Destiny's Child)
Misha B.- Heat Wave/ A change is gonna come (Motown), Ain't no sunshine (Lighthouse family)