Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The best Gould bio, period!

Although Mr. Friedrich was a Gould fan, he brought the clear eye of the professional journalist to this work, with a balanced account of the man, the music, and the myth. Much better than Payzant's book, which read like the work of an obsessive sycophant. I'm looking forward to Kevin Bazzana's new bio... this presents a hard act to top.