Klezmer Scores, PDFs of full-score and part-wise sheet music for fully orchestrated klezmer music. Many of the included scores include MP3s of recordings of the works.
I found this while trying to figure out how to do D.S. al Coda in Lilypond 2.2. "Bolter Bulgar" includes an example, but the Lilypond source is not on the site. I found an answer deep in some Lilypond notes somwhere, involving setting the text manually (within the notes section):
\markup{ \musicglyph #"scripts-segno" }
\markup{ \bold "To Coda" " " \raise #1.1 \musicglyph #"scripts-coda" }
\markup{ \bold "D.S. al Coda" }
\markup{ \bold "Coda" " " \raise #1.1 \musicglyph #"scripts-coda" }
Dunno if this is easier in newer versions of Lilypond...