Add slick looking Amazon MP3 widgets to your blog posts in a brain-dead simple way! 
Just say [mp3] to add mp3 tracks anywhere on your blog.
The MP3 Clips widget plays album previews and displays the album art in the background. It’s as easy as typing [mp3] anywhere in your post and you get a beautiful Flash widget with mp3 tracks.
There are many ways to create an MP3 widget. Here are some:
<ol>
<li>
<code>[mp3]</code> 
This creates an MP3 widge containing the latest MP3 bestselling tracks.
</li>
<li>
<code>[mp3 list="Bestsellers" browse_node="324527011"]</code> 
This creates a MP3 widge containing the latest ‘Hard Rock and Metal’ bestsellers. 
You can get the browse_node values for various music genres here: http://www.browsenodes.com/node-324382011.html
</li>
</ol>
Here are the most popular browse nodes: 
Alternative Rock (324384011) 
Blues (324396011) 
Broadway & Vocalists (324409011) 
Children’s Music (324414011) 
Christian & Gospel (324420011) 
Classic Rock (324431011) 
Classical (324442011) 
Country (324492011) 
Dance & DJ (324504011) 
Folk (324519011) 
Hard Rock & Metal (324527011) 
International (324537011)
Jazz (324552011) 
Latin Music (324570011) 
Miscellaneous (324577011) 
New Age (324586011) 
Opera & Vocal (324591011) 
Pop (324608011) 
R&B (324621011) 
Rap & Hip-Hop (324633011) 
Rock (324645011) 
Soundtracks (324660011)
<ol>
<li>
<code>[mp3 keywords="Sunshine" browse_node="324608011" title="Sunshine tracks in Pop"]</code> 
This creates an MP3 widget containing all the ‘Pop’ tracks with the word ‘Sunshine’ in the album/song title.
</li>
<li>
<code>[mp3 asins="'B0011Z0YR2,B00137W4P8,B0013G0PG4,B001AU8ZLK,B001AUCJZ8,B001AUEMDK,B001AU8YB6" title="My favorite MP3 songs." shuffle_tracks="True"]</code> 
This creates an MP3 widget with the specified tracks. The tracks are displayed in random order each time that it is displayed.
</li>
<li>
<code>[mp3 browse_node="324608011" tag="ohmyki-20"]</code> 
This creates an MP3 widget containing bestselling mp3 tracks in Pop. Since the ‘tag’ parameter is specified, you will earn an Affiliate referral fee for any sales made through this widget.
</li>
</ol>
You can customize a lot more in your MP3 widget. Check out the FAQ section for more details.

WP-Amazon-MP3-Widget

Add slick looking Amazon MP3 widgets to your blog posts in a brain-dead simple way! Just say [mp3] to add an MP3 widget anywhere on your blog.

Brady Vercher

AudioTheme

brodyvercher

Luke McDonald

Cue makes it easy to create and manage beautiful, fully responsive audio playlists. Primarily built with music in mind, Cue can also be used for podcasts, sermons or to showcase voice over samples.
There’s no need to fiddle with XML, JSON, or FTP. Just upload audio files with the familiar WordPress Media Manager, then insert them into a playlist with the click of a button. Cue fetches metadata from uploaded files to automatically complete the title, artist, and length for each track.
It works on desktop, tablets, and other mobile devices.
View a working demo at <a href="https://audiotheme.com/view/cue/?utm_source=wordpress.org&utm_medium=link&utm_content=cue-readme-demo&utm_campaign=plugins" rel="nofollow ugc">https://audiotheme.com/view/cue/</a>.
<h3>Features</h3>
<ul>
<li>Create unlimited playlists.</li>
<li>Embed a player in any post, page, or sidebar using a shortcode or widget.</li>
<li>Reorder tracks with a simple drag and drop interface.</li>
<li>Seamlessly integrates with WordPress’ media manager to select audio and images.</li>
<li>Automatically fetches title, artist, and length from the metadata if it’s available.</li>
<li>Completely responsive to work on any device that supports your audio format.</li>
<li>Link to external sources like Amazon S3 or other CDNs.</li>
<li>Customize the player background image.</li>
<li>Use custom artwork for each track.</li>
</ul>
<blockquote>
Level up with Cue Pro
<a href="https://audiotheme.com/view/cuepro/?utm_source=wordpress.org&utm_medium=link&utm_content=cue-readme&utm_campaign=plugins" rel="nofollow ugc">Cue Pro</a> is a premium add-on with a number of useful features. It includes:
<ul>
<li>Insights into how visitors interact with your audio.</li>
<li>Purchase and download links for each track.</li>
<li>New themes to change the appearance of the player.</li>
<li>Playlist sharing to allow fans to embed your players on their own sites.</li>
<li>Popup functionality so visitors can continue listening while browsing your site.</li>
</ul>
Cue Pro purchases include email-based priority support and help support development of the free version of Cue.
</blockquote>
<h3>About AudioTheme</h3>
Cue is built by the team at <a href="https://audiotheme.com/?utm_source=wordpress.org&utm_medium=link&utm_content=cue-readme&utm_campaign=plugins" rel="nofollow ugc">AudioTheme</a>. We’re a small, independent team of designers, developers and musicians focused on creating and supporting professional, world-class WordPress themes and plugins for bands and musicians.
Cue was originally integrated in our commercial platform, but we wanted everyone to have the ability to easily create beautiful playlists, so we released it free for general use. It powers the unique players in all of our premium music themes, as well as <a href="https://audiotheme.com/view/cuebar/?utm_source=wordpress.org&utm_medium=link&utm_content=cue-readme&utm_campaign=plugins" rel="nofollow ugc">CueBar</a>, a site-wide, continuous audio player made for WordPress.
We care about our work and stand by it. We’d love to have your support and the opportunity to earn your loyalty.
<h3>Support Policy</h3>
We’ll do our best to keep this plugin up to date, fix bugs and implement features when possible, but technical support can only be provided for active AudioTheme customers. If you enjoy this plugin and would like to support its development, you can:
<ul>
<li><a href="https://audiotheme.com/?utm_source=wordpress.org&utm_medium=link&utm_content=cue-readme&utm_campaign=plugins" rel="nofollow ugc">Visit AudioTheme</a> and tell your friends!</li>
<li><a href="https://wordpress.org/support/view/plugin-reviews/cue#postform" rel="ugc">Leave a review</a> and let everyone know how much you love it.</li>
<li><a href="https://twitter.com/AudioTheme" rel="nofollow ugc">Follow @AudioTheme</a> on Twitter.</li>
<li>Help out on the <a href="https://wordpress.org/support/plugin/cue" rel="ugc">support forums</a>.</li>
<li><a href="https://github.com/audiotheme/cue" rel="nofollow ugc">Contribute on GitHub</a>.</li>
</ul>

Cue by AudioTheme.com

Great plugin for playing on-server audio files on your site!
And the authors of the plugin are very helpful!

WP-Amazon-MP3-Widget vs Cue by AudioTheme.com