Instead of offering an HTML5 player to modern browsers and a totally separate Flash player to older browsers, MediaElement.js upgrades them with custom Flash and Silverlight plugins that mimic the HTML5 MediaElement API.
HTML5 Music Player is a jQuery plugin which lets you play mp3 as well as ogg files.
AAP uses the HTML5 <audio> element for browsers that support it, and the Yahoo! Media Player for those that don't. It is fully accessible cross-browser media player.
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