I'm saddened to hear of the passing of Velvel Pasternak, Z"L. His company, Tara Publications, was a gamechanger in the Jewish music world, publishing all sorts of sheet music collections from Chasidic, Israeli, Klezmer, Sephardic and more. Velvel was a teacher and ethnomusicologist who lectured widely about Jewish music. Here's a clip from one such lecture. Yehei zichro baruch.