These sites have a ton of music, mp3 files to hear the songs and also lyrics in English and Hebrew.  Not as many pdf downloads for sheet music as is available for other holidays. http://www.totshabbat.com/Purim-Tu-B-Shvat.html and http://www.hebrewsongs.com/purim.htm  has tons of lyrics in Hebrew  

This site has a lot of the classics and more. Many songs are available for free as pdfs with either guitar and/or piano sheet music as well as lyrics.  Some lyrics are in Hebrew others just in English. http://www.totshabbat.com/Passover.html