The Russian Choir of the University of Freiburg is Golosá's parent choir. Their website (in German) is here

Other Russian Choirs in the United States:

Slavyanka

The Yale Russian Chorus

The Middlebury University Russian Choir

Other sites of interest to the Russian music lover:

The 'Little Russia' site has lots of information and on-line sound clips

Musica Russica is a wonderful source for all kinds of Russian music