If you ever play at Irish sessions, you owe it to yourself to buy this app. It links into a number of online music databases and you can bring up a tune by title as long as you have an Internet connection. Thats not where the magic is, however. If you are at a session and hear something new, you can have it sample 10 seconds of it at any point during the melody and Tunepal will tell you what it is, bringing up sheet music if you so desire. (It will even keep track of which pub you heard what in by recording GPS fixes.)
So how accurate is the tune identification? It is dead on almost every time, regardless of the instruments, the noise level in the pub, etc. When its guessing the tune, it puts up a list of candidates ordered from most to least likely, along with a percentage certainty. Tunepal is actually rather modest most of the time. It may say its only 60% sure the top choice is right, but in my experience, its nearly always right anyway. If you are the first to show up at a session with Tunepal in hand, it will generate a lot of conversation and people will invariably try to stump it, only to be amazed at just how hard it is to fool.
ekchew about Tunepal, v1.81