Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Prelude to a masterpiece

Excellent album from Quebec pioneer metal band. It took the direction of their previous album, Killing Technology, with more elements of progressive rock while maintaining their thrash roots. Add to that clean vocals (as opposed to throat vocals of previous albums) with excellent compositions, and you'll get Dimension Hatross, an almost perfect album. It may take at least 5 listens to completely assimilate the songs as they are dissonant and not easy to get into, but if you're patient enough, they will be rewarding. Voivod would later continue in the same direction and perfect their new style on their next album, a masterpiece called Nothingface.