This category in the Tarbuton blog is designed to provide resources for travel to Israel, learning about Israel, and more.
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