On Wikipedia https://en.wikipedia.org/wiki/Profeti_della_Quinta
Alternative Spellings Prophets of the Perfect Fifth
City Basel, Switzerland
Country Switzerland
Links Allmusic

Profeti della Quinta (Prophets of the Perfect Fifth) is a male vocal ensemble, specializing in the music of the Renaissance and Baroque periods. Founded in the Galilee region of Israel by Elam Rotem, the ensemble is currently based in Basel, Switzerland, where its members undertook advanced studies at the Schola Cantorum Basiliensis. The core of the ensemble includes countertenor, tenor and bass singers, who perform either a-cappella or together with period instruments such as theorbo and harpsichord. wikipedia