Once known as song identification iPhone app Midomi, SoundHound goes beyond identifying that tune and comes with an inbuilt music player, with the ability to look up lyrics on the fly.
What sets SoundHound apart from other iPhone apps like Shazam lies in its music playback, distinguishing it from its predecessor Midomi. The whole entire iPod library is accessible (minus podcasts), and adds extra information such as lyrics and artist information to whatever you are currently playing. Like the iPod music player, music playback continues even if you close the app, meaning it has the capability of replacing the iPod function.
Other than that, SoundHound did a fair job of identifying every song we threw at it. The main point to keep in mind is that the free version of SoundHound comes with a limit of how many songs you can identify: five per month, to be exact. If you want to use this function more, you'll have have to shell out $5.99. SoundHound is a free iPhone app available through iTunes for the iPod, iPhone, and iPad.