Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: a "children's opera" for adults

This opera is for those who are tired of the standard repertoire. I was attracted to the Decca recording of this opera on discs, with Lucia Popp, because it was so unusual (cartoon animal and human characters, episodic anti-romantic story). Even though I found it highly intriguing, I could not sustain my concentration beyond the first act. I was attracted to this DVD because I was curious how the animal roles could be staged. The real stars here are Director Nicholas Hytner and Bob Crowley's vividly colorful sets. Some scenes are genuinely funny (the vixen killing the chicken). Even though I sustained concentration through two acts out of three, this is a very unique (and rare) production, of the kind you will rarely see in any opera house. Technically excellent, a strong buy recommendation (only 4 stars out of caution - try any other piece by Janacek first to see if you warm up to it).