Check out the sound snippets collected by The Freesound Project. There's a database of interesting sounds, not songs, all licensed under Creative Commons. Visitors to the site can browse for sounds based on keywords, or tag each sound they hear, which adds a fun and interactive component to this collaborative website project.

Results from the sound tagging are being used to find out if people invoke a common vocabulary to describe a sound. Eventually, there will be a system to retrieve the sounds automatically from the database according to descriptions of each sound's audio characteristics. Can you describe a sound with words?