About Russian rock opera

The phrase sounds, perhaps, attractive. Lures by unusual, extraordinary, dissimilarity. Such are his internal promises. Maybe it is from the concepts of rock music, rock culture, which immediately set up a "protest wave". But if you suddenly have to plunge into the depths and essence of the issue of rock opera, then suddenly it turns out that there is not much information and music itself, but on the contrary there is enough uncertainty and nebula.