Brigitte Küpper - Horizont is a German vocalist, a member of VocColours, who has also collaborated with Jouri Grankin, Christian Barthold and Martin Hauf. She is also the producer of the documentary "The Feral Voice".

Gala Hummel is a vocalist known for the group VocColours.

Norbert Zajac is a free improvising vocalist, known for the groups VocColours and zvuKlang.

Vocalist Iouri Grankin is a Ukranian jazz vocalist, born in 1959 and who graduated from Kharkov University, Department of Mechanics and Mathematics, in 1976. He is best known for the group VocColours.

Andrei Razin: "Graduate of the Moscow Conservatory, composer, pianist and arranger, Laureate of the National Festival "Art of the Young", Laureate of the National Competition of Young Composers, Member of the Russian Union of Composers, Andrei Razin was destined for the career of an academic musician, but his creative interests have a much wider range. He produced music scores for the theatrical performances, modern chamber instrumental and vocal music, jazz compositions, music for TV shows and advertisement videos, symphonic music. Razin participated in Russo-French Festival of Modern Improvisational Music, and numerous other festivals, performed with Arkady Shilkloper, Mike Ellis, Vladimir Chekasin, etc. Andrei Razin was also awarded the ''Composer of the year'' (2002) awards by Russian Jazz Journalists Association. As a leader of Second Approach trio, Andrei Razin performed in Germany, Poland, Lithuania, Ukraine, Moldova, Belarus, and Finland."