Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Q: I bought these. After two uses (the first being a french vanilla cake, and the second fudge brownies), they stained from the brownie batter and will not come clean. I figured these would be better quality, since they ARE kitchen aid.

A: Negative
****
Q: As a musician and musicology student, I am very familar with both the "classical" world of music, and the popular world of music, and I have to say that perhaps string quartet versions of R.E.M. might be interesting, but you need a creative and enterprising quartet (such as Kronos Quartet, etc.) to do this. This CD is greatly disappointing because the transcriptions are simplistic and lacking imagination. String quartet recordings can be very exciting, but not here!

A: Negative
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Q: I didn't like some of the plot twist, of a former leader of the Autobots but other than that it was pretty good.

A:
Positive
****