• Mobile browser's ignore the autoplay attribute on <audio> and <video> elements. Stupid reasons include saving mobile bandwidth on behalf of the user and/or securing app store sales.
• Audio and video elements will only play as the result of a user interactions (click, touch).
• A workaround is to have a "start button" in your application that loads and plays an initial sound.
• You can now play further sounds without user interaction by changing the source on the same <audio> element.

I tested this on Chrome for Android. The interweb says Show archive.org snapshot it should work on Mobile Safari as well.

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