Songs for Theme:

"If I Die Young" by The Band Perry

"Lighters" by Bad Meets Evil featuring Bruno Mars

"Barefoot Blue Jean Night" by Jake Owen

"Kryptonite" by 3 Doors Down

Isaiah:

"Beverly Hills" by Weezer

"Speed" by Montgomery Gentry

"Shimmer" by Fuel

"Santa Monica" by Everclear

Rachel:

"Mean" by Taylor Swift

"Little Miss" by Sugarland

"Fallen Angel" by Poison

Songs for specific scenes:

The first time Rachel sees Isaiah: "Animal" by Def Leppard

When Isaiah decides he likes Rachel in the bar/apartment:  "Possum Kingdom" by Toadies

Isaiah and Rachel's first kiss:  "Just a Kiss" by Lady Antebellum

Isaiah's New Year's Eve:  "You and Tequila" by Kenny Chesney featuring Grace Potter

Songs that represent Isaiah and Rachel's future:

"Ours" by Taylor Swift

"Fast Cars and Freedom" by Rascal Flatts