If you wonder what kind of songs would fit as a clan theme. Well this is my personal list of what I think would be a clan theme song.
All Stars: 'We Are The Champions' Queen.
Bangers: Any song based on there genre (since most of the members are based off famous rappers)
Berzerk: Any song under Death Metal.
Fang Pi Clang: Any song with kung fu, or songs by Wu Tang Clan (the latter being inspiration of the clan's name)
Freaks: Any song that is affliated with circuses.
Frozn: Song based on ice.
GHEIST: Any song representing evil.
Huracan: Latino-base music (or the themes to Eddie Gurrero, Rey Misterio, and/or Sin Cara).
Jungo: Tribal-based music.
Junkz: Anything under hardcore rave.
La Junta: Anything to do with Trumpets.
Leader: 'Leader' Bif Naked.
Montana: The entire score to The Godfather movies.
Nightmare: 'Monster Mash' (I don't know the name of the original artist).
Piranas: Pirate themed music.
Pussycats: 'I am Woman, Hear Me Roar' (I don't know the name of the original artist)
Rescue: 'Dr. Feelgood' Motle Crew.
Roots: Reggae-based music.
Saks: 'Intergalactic' The Beastie Boys.
Sentinel: 'Bad Boys' Inner Circle.
Skeelz: 'Schools' Out for Summer' Alice Cooper.
Ulu Watu: Anything with a Ukelele.
Uppers: The theme to Lifestyles of the Rich and the Famous.
Vortex: The score to The Terminator.