iPhone and Shazam a great pair

iPhone applications provide all sorts of helpful functions, such as the Typepad app. to update one's blog [being used to male this post] and I discovered just now a very useful one, Shazam [there are similar ones available] will listen to music and identify it - I have several tracks in my iTunes which need identifying but until now I couldn't but I just played one, put my iPhone up to listen to it, it "tagged" it and I was then able to update my iTunes list info- great use