Most piyutim (sacred Jewish song poems) are chanted "a cappela." This one is accompanied by Tunisian oud music. The oud (ud) is similar to a lute. You'll hear traces of tambourines, too. And some kind of percussion; perhaps boot heels, perhaps knocking on wood...
A list of all the singers (paytanim) and musicians performing piyutim (sacred song poems) on this website. Mostly for unaccompanied voice, piyutim are sometimes expressed with instruments like the violin, oud, ney, tambourine, darbuka, riq, and so on.
Piyut is a poem sung to God or about God. Piyut is also a prayer that expresses emotions in relationship to God, including praise, glory, joy, sorryow, anger, gratitude, lamentation, celebration, respect, fear, fury, loneliness, and longing. Piyutim are a crying out for connection with God.
A beautiful, sweet, yearning, graceful Modzitz Hassidic melody affiliated with "The Admor Shaul Yedidya of Modzitz (1887-1948)." It's simple, with just voice and steel-stringed guitar (and a baglama?)
These twelve selected Piyutim are the gems of Hebrew poetry. All are chanted and sung. Some are accompanied by tambourine, oud, and percussive sounds. Most are sung "a cappela," without instrumentation.