Using the International Phonetic Alphabet and multiple vocal effects (tongue clicks, coughs, gargles, etc.), Eckardt seeks to represent glossolalia, speaking in tongues. Dithyramb is the fifth movement of a larger work, Tongues, which Eckardt has described as a concerto for voice. And, he points out, Dithyramb would be the cadenza for solo voice, encompassing everything that had come before. For advanced singers.