AudioTag.info — is a free music recognition service. It allows identifying almost any unknown piece of music quickly and easily. The use is very simple: upload a short audio fragment or an entire song (in fact, even 10 second fragment is enough), let the robot analyze it and provide you with the information about the track title, artist name, album title, etc. Your audio fragment can be in almost any file format and of almost any quality (aurally recognizable, of course): it can be an MP3 file downloaded from the Internet or a short recording made with your old tape recorder and digitized into a low quality audio file. AudioTag can also recognize audio directly from Youtube and other video sharing services.
Read more on the FAQ page.