MusicBrainz Announces The AcousticBrainz Project

The MusicBrainz Blog: Announcing the AcousticBrainz project:

The AcousticBrainz project aims to crowd source acoustic information for all of the music in the world and make it available to the public. The goal of AcousticBrainz is to provide music technology researchers and open source hackers with a massive database of information about music.