So I was thinking of it and each character has a song I find goes wit them.

Rarity is from the Danish band Volbeat Lola Montez

Rainbow Dash is an oldie Rainbow in the Dark from the very talented Dio

Fluttershy song almost makes me want to cry whenever I think of both of them cause it's Sweet Child O' Mine by Guns N' Roses

Applejack Hard Sun Eddie Vedder, don't ask me why, cause I couldn't tell you why.

Pinkie Pie is so random she has multiple songs Ohh Eeh
BODIES

Tia is a dumb happy song Here comes the sun. by The Beetles.

Lulu is actually a brony song by Eurobeat Brony Luna and is one of my all time favorites brony and non brony song.