The music of "Wozzeck and Chugra" stretched from moderate to extrem avant-garde and was an artisitic experiment for the band memebers. On some occasions, during the eighties, Svetoslav Bitrakov played along with the group on flute.

In the end of 2005 George Marinov and Svetoslav Bitrakov meet accidently and decide to put some music on tape. So, during the recording, the idea of Slav de Hren is born and the result is the album "Tavata".

In 2007 Svilen Ivanov (Bass) and Petya Dankova (Vocal) joined the group and they recorded their second album "Pictures at an Exhibition" - a punk-jazz version of Mussorgsky's piano suite.