DanCoulter

Musicians need a way to easily organize information about their music. This plugin 
exists to do just that. It lets you publish a list of albums and auto-generates 
a WordPress page for each song, so that fans can comment, save links to your songs 
and share them with friends.
<h3>Roadmap</h3>
<ul>
<li>0.2 – file uploads and management (mp3, images, etc.)</li>
<li>0.3 – Custom data fields to let you store any arbitrary data with your music</li>
<li>0.4 – User submitted content management and display</li>
</ul>

Discography

Organize your discography; and offer downloads, streams and ways to buy your music.

robertkay

HTML5 MP3 player with Flash Fallback. Play music while browsing your site – 100% AJAX enabled! Please be gentle with reviews – this software is in public beta & will get more user friendly through your feedback.
Also allows you to organise Artists/Albums/Songs from your wordpress dashboard and display them in your pages/posts via shortcodes and a sidebar widget player.
To see a live demo and instructions go to http://musicletloose.org
This plugin is part of a larger project to provide musicians with free online tools to present and promote their work. We’re using http://browserstack.com to check our forthcoming front-end templates on every imaginable device. Many thanks for their great product and their generous support of our open source development program.

Discography vs MLL Audio Player MP3 Ajax