The famous music recognition software, Shazam, also expanded its offering to the Android platform. Available in two variants on the Market Google, Shazam is offered in the basic version for free.
In fact, thanks to this free version, you can use the service for a limited number of tags 5 per month, against those of the unlimited version of Encore (offered at about 3.50 €) already present on other stores. Shazam lets you find the title and author of a particular song, as well as a range of related services. To download on your Android device, here's the direct link.