Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The only complete recording available - unfortunately.

It is very unfortunate that the only available recording of all of Krenek's quartets is so marred. The performers are obviously struggling with this music; they are often wildly out of tune, and their ensemble rhythms are very sloppy. The producers and editors have not done a great job, either: somehow they completely missed the fact that the first two beats of Quartet no. 6 have been cut off! The music, however, is very strong (especially Quartet no. 7), and does manage to deliver its message despite the drawbacks. If you're really interested in these works, this is the only way to hear them. If you're merely curious, choose something else - this set would be a very bad introduction to a very fine composer.