Instruct: Classify Amazon reviews into positive or negative sentiment
Query: in my opinion, a pop/rock masterpiece

LET GO is an incredible piece of rock music from one of the best new voices I've heard. For a long time I've privately lambasted modern acts for not having anything new to say or a new way to say it. Avril Lavigne's album is a bright silver lining on an ever darkening cloud. Avril's voice is the most striking feature of the entire album. From hard rock, acoustic pop and balladry, she can sing it all and hits each note full and strong. Her versatile singing is shown to best effect on my favorite song of hers, "I'm With You." Her melodies are creative and all catchy, even on the darker sounding songs. This is an album which will not sound horribly dated in years to come. The production is clear and vibrant. Avril is a musician to watch. I'm eager to hear her second album.