Vox Clamantis - "Part: And I Heard a Voice". Estonian vocal ensemble Vox Clamantis and their leader Jaan-Eik Tulve have established themselves among the leading interpreters of Arvo Part's music over a quarter-century of close collaboration with the composer - a relationship that builds on the almost half a decade-long artistic partnership between Part and producer Manfred Eicher. 'And I heard a voice' was recorded in Haapsalu Cathedral, Estonia and is released as Arvo Part turns 90.