Mycale: Book of Angels Volume 13 is an album by the vocal group Mycale performing compositions from John Zorn's second Masada book, "The Book of Angels". Ayelet Rose Gottlieb stated "We've been told that we have managed to create our own "language" within this a cappella quartet ... the foundation is our music are the compositions of John Zorn, which in this case are melodic tunes, based on the "jewish scale" ... but always with a twist that sends the pieces off to another place, beyond straight klezmer ... on top of that are our arrangements, and text choices."