Invocation / Supplication (By Norse Music), the new offering from experimental cellist Jo Quail, is actually a compendium of two connected three-song cycles. The first, Invocation, features the contributions of Heilung vocalist Maria Franz, plus brass instruments, percussion, bass and a choir assembled from crowdsourced mobile phone recordings of individual syllables. Supplication, on the other hand, is a less embellished affair, with just vocals from Lorenzo Esposito Fornasari and Koen Kaptin’s trombone parts to augment Quail’s cello and sound design.