You will need to know the basics of how to use PHP, you will then need to create a connection to the mysql database with php see: PHP MySQL Tutorial once you have done that you should go about looking for php tutorials on uploading files and how you can limit the files size/type etc... From there you will need to find/make a player for playing the music, if you make one you will probably need to make it in flash.

Hope thats of some help,
Lee.

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