Barbarian - "Born to be Wild"
Bard - "Play That Funky Music, White Boy" or "The Great Street Performers" - Suikoden II OST
Cleric - "Soul Man"
Druid - "What the Forest Taught Me" - Secret of Mana OST
Fighter - Hm, dunno if I can top "If I Only Had a Brain"
Monk - "Kung Fu Fighting"
Paladin - "Battle Hymn of the Republic" or "Fight the Good Fight" - Triumph
Ranger - "Lone Ranger"
Rogue - "Rouge" - Michel Sardou

Sorceror - You Can Do Magic" - America
Wizard - Backdraft - "Burn it All"
Commoner - "The Banana Boat Song (Day-O)" by Harry Belafonte
Shadow Dancer - "Moonlight Shadow" - Dance Dance Revolution 5th mix
Blackguard - "Light from the Netherworld" -Xenogears OST
Assassin - "Assassin's Blade" - Secret Chefs 3
Dwarven Defender - "Dwarf Invasion" - Reggie and the Full Effect

One of the OA classes - "I Like Chinese" - Monty Python
Lidda - "She's Actual Size" - They Might Be Giants