Today's free app is Shazaam Encore, normally $4.99
I highly recommend this app. I have been using shazaam for a few years and it is awesome at identifying music. Several months ago shazaam created this encore version and it is the only way to have unlimited tagging unless you previously had the free version. If you had the free version you only get to keep all the features until you switch phones though. Even if you don't tag that much music this is a must have app for those times you do wonder the name or artist of the song playing. I recommend you go ahead and grab it while it's free!
"Is life so dear, or peace so sweet, as to be purchased at the price of chains and slavery? Forbid it, Almighty God! I know not what course others may take; but as for me, give me liberty or give me death!"
-Patrick Henry, March 23, 1775