What are some alternatives?
When comparing WhoSampled and SoundHound, you can also consider the following products
Shazam - Shazam is a mobile app that recognizes music and TV around you.
Serendipity by Spotify - Map shows when two people play same song at same time
MusicID - Hold MusicID up to music and it'll tell you the name of the song in seconds.
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm
WatZatSong - WatZatSong is a community of music enthusiasts who can identify most songs and tracks.
Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.