Shazam is great at music ID from the radio or a CD or anywhere you are listening to a music recording. I even used it to find out a song off a movie preview and it worked great! In fact Shazm has figured out nearly every song that I have played to it.

Midomi is interesting and I’m thinking a bit more fun then useful. I can sing to it or hum to it and it will suggest a list of songs that match what it thinks that I am singing. Although within the list sometimes it does pick the right song, it isn’t always spot on and sometimes it doesn’t come close. But Midomi is still a fun toy to play with. My favorite part is that when I click on one of the songs that it thinks I sung, I can listen to other people – i.e. non-professional-singers – singing the same song.

Both apps are free. And their features seem different. I see no reason why you couldn’t get both.