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.
I can't say it's something I've really thought about but I have to say that for the Piranas, it might be a good laugh to hear 'You are a Pirate' from the Lazytown series. Equal amount of lulz if the La Junta had Edwin Star's 'War (What is it good for?)' as their theme. XD However, I have heard a couple of songs that I would say could incorporate all the clans, especially Kidz by Take That. Have a listen if you have the time
Piranas: He's a pirate (Pirates of the Cariebbean)
Frozn: Ice Ice Baby (Vanilla Ice)
Uppers: Rich Girl (Gwen Stefani)
Ulu Watu: Roller Coaster Ride (Lilo and Stitch) http://www.youtube.com/watch?v=nXpB1rixnPQ DEFINETELY!
My oddball choices:
Nightmare : Misfits - Fiend Club
Berzerker : The Meteors - Hell ain't hot enough for me
Sakhrohm : Ozric Tentacles - Spacebase
Junkz : Huoratron - $$ Troopers
Roots : Shpongle - Divine Moments Of Truth
Piranas : Dropkick Murphys - Rose Tattoo
Pussycats : Cyndi Lauper - Girls Just Want To Have Fun
GHEIST : Justin Bieber - Never Say Never (on repeat, and no - you dont have pencils at hand to stab your eardrums)
Junta : Captain Jack - Captain Jack / Wagner - Ride of the Valkyries
Jungo : Iggy Pop - Lust For Life
Freaks : Benny Hill Theme
Frozn : Sentenced - Frozen
Leader : Tchaikovsky - 1812 Overture
... I think I nailed it pretty well.