All of his songs, or most of them, are parodys so they all sound like another song. EX. Canadian Idiot - American Idiot, Amish Paradise - Gangsta's Paradise, Complicated Song - Complicated, White and Nerdy - Ridin' Dirty. Those are some examples. And his Polka Song has a ton of different older songs all in one. It is funny but all my friends think he is so weird. Haha, it makes me laugh.