It turns out that MP3s encoded as data: URIs are useful - an URL shortener to a data: uri would allow tweeting of MP3s.

chomp3 aims to be a service to encode MP3s as URIs so they can be more easily shared.

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S3 for cheap storage. Running on EC2 for free S3/server transfer. Uploader in Django, streaming that data: URI to S3. Service using nginx for html and varnish for ESI of the wrapper. fabric for deploy, chef for server config