Q: how can i publish my music

Your question is rather vague. Do you mean sell music you have created in the iTunes Store? If so, please see this page:

http://www.apple.com/uk/itunes/working-itunes/sell-content/music-faq.html

Or, since you've posted in the Producing Podcasts forum, are you asking about creating a podcast (which is free for listeners)? If so, poease start by seeing my 'get you started' page on podcasting - http://wilmut.uk/pc