Oh, I see. You meant sheet music in the hand, hard copy, not already in the machine. I just type it in, the long way.
On the other end of the stick, MT has a program, Passport, that promises to take a tune you hum or whistle into the mike and turn it into sheet music, but I haven't tried that yet.
That is to say, I have it, but I haven't learned how to use it yet, so I don't know if it works.