There are different ways to upload an audio file and broadcast it using drupal. You can have music auto-play on your homepage or any page you choose.

The following code can be put into page or block:

Another broadcast alternative it to use Drupal's audio module. This allows you to upload audio files and categorize by author, album, etc. You can simply use this module to give users the option to play or download a song or audio file. Setting up drupal audio modules is quick and requires no special server setup. The hard part is deciding if you want to give download access to the Internet public.

Here is link to a sample website using the Drupal audio module for podcasting.