Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Saw the concert

I went to the concert in Boston. Same song list. Eric came out by himself with an acoustic guitar and started into "Key To the Highway". I also bought the cd edition with the dvd. Overall, a great concert, the cd and dvd sound great, and the acoustic version of "Bell Bottom Blues" was a real treat. During the recognition of an excellent group of famous musicians, Clapton was playing the intro to "Over the Rainbow" which was an added treat.