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1.
Someone who believes that their music is better than everyone else's, and believes that they have the right to decide who is a poseur and who isnt.
Music Nazi: You listen to Blink182?! You poseur!

Random Guy: Actually, I never said I was punk...
by Mike Rotch April 28, 2005
 
2.
someone who can't stand listening to crappy music, or commercials, or whatever happens to piss them off.
therefore, whether covertly or overtly, this individual exerts control over the radio/source of music, regardless of location (i.e. car or your birthday party). can be quite annoying, but some are true gold mines of excellent music.
"I am a complete music nazi. Which is okay, because I am saving us all from your crappy music selection. Yes, I realize it is your boyfriend's sister's cousin's party."
by Music Nazi April 29, 2005
 
3.
listener of music who believes their musical preferences should be the ONLY music enjoyed by others, typically associated with douscheness
Zane: i wus tryin ta jam on sum Marley but Rob wouldn't listen ta shit but his indie

Me: yea he's got aight taste but he hates on all shit he don't listen to...who da fuck hates on Marley?

Zane: Music nazis
by DaEnlightened1 May 10, 2009
 
4.
Any company that trys to control your music collection.
Itunes - Apple and any other website that you can download music from that charges a fee.
Music Nazi
by Gdog00187 April 01, 2010
 
5.
1. person who shows bias to the music you like and does not let you listen to what you like.
mike is lisening to a mixed cd you gave him and he skips over all the rap songs and listens just to the rock ones this is a musicnazi.
by AJ.sweetwine June 05, 2007