Here’s a free JewishMusician.com lead sheet for a well-known Purim melody, “Mishenichnas Adar,” as performed on “Purim Sameach.” You can download a PDF by clicking on the sheet music image.
As well, Avremi G. has posted more free Purim sheet music at "A Notable Idea."
There's still more free sheet music, mainly kids songs, over at Tot Shabbat!
