Some ways to find out who performed a song are to use an app, such as Shazam or Soundhound, to search for song information; use a website, such as Midomi.com to record yourself humming a song; and WatZatSong.com. Alternatively, search Google for the song lyrics if you know them.
Soundhound is available in both the Google Play Store and Apple Store. WatZatSong is a social website where users upload recordings of the song they want to identify. Other users on the website listen to the clip and help the user figure out the song's name. This website also has a social network cross-posting feature that allows users to share their searches to sites such as Facebook and Twitter so that friends can assist in identifying the song as well.