DxC: I make them good girls go bad

DxC: Bad Boy

NXC: covered ( really good song )

TXG: The Way I Loved You by Taylor Swift (PERFECT SONG FOR THAT COUPLE!! IT EXPLAINS ALL THAT THEYVE BEEN THRU!)

DxC hands down by dashboard confessional

DxC: Numb by Linkin Park

TxG White Horse

HeatherXAlejandro
Alejandro

SxC (SierraxCody): Paparazzi by Lady GaGa or (If they do become a couple) I Wanna Marry My Stalker by Goldfinger

DXC: Hushabye-KoRn(It actually fits them :3)
and
TXG: Odd one-Sick Puppies

GxD- bad romance, lady gaga, you belong with me, taylor swift, and teenage dream, katy perry

DXC:Bad boy(Casadea)
SXC:Telepone(Lady gaga ft. Beyonce)
GXT:Bad Romance(Lady Gaga)

DuncanxGwen- Average Girl~ Emily Osment, Teenage Dream~ Katy Perry, Saltwater Room~ Owl City
HeatherxAlejandro- Alejandro~ Lady GaGa, The Girl Can't Help It~ Mitchell Musso, Don't Unplug Me~ All Caps, Evil Love~ From Phineas and Ferb episode "Chez Platypus"
SierraxCody- Paparazzi~ Lady GaGa, Your Love Is My Drug~ Ke$ha, Turn Right~ Jonas Brothers
TrentxCourtney(my ultimate fav fannon!)- Teardrops On My Guitar~ Taylor Swift, Still In Love With You~ Jonas Brothers (it goes with a crazy theory I have)
And the ultimate Anti-DxC song!- White Horse~ Taylor Swift
EDIT: My mistake, the ultimate anti-DxC song is Que Sera~ Hannah Montana ;)