The cat macros of the music world. God forbid we find a pop band called "i can haz cheezburger" in the not-too-distant future.
I normally don't have a problem with how band names are spelled. Hell, I adore the Beatles and think the Monkees are kicking, so it'd be stupid of me to say, "No, no, you can't do that!" But when it starts affecting how you spell the word in real life, then it gets a little stupid. I fear that the spelling of ludicrous is forever lost, thanks to the rapper of the same name.
Ironically, I have the same problems with Santa Claus for the exact same reason.