Instruct: Classify Amazon reviews into positive or negative sentiment
Query: WoW!!!

This Cd is fantastic! It is one of the best rock albums of all time by one of the best Rock groups, Tool. Of course without Maynard james Keenan, Tool would be good, but he takes them that step further above the rest. The lyrics are both haunting and overwhelming, and the way in which MJK sings them adds to the whole picture. The guitars have a very gritty atmosphere about them which helps the whole grunge prospect from Tool. Undertow, is, like any Tool fan should know, completely unique, as is all other Tool albums. Never expect a similar album from Tool.Undertow is possibly the most aggresive, although Opiate has the most aggressive lyrics, but in Undertow Tool have advanced. Aenima has much more depth and layering, but Undertow is just great hard rocking stuff!Nice One Tool.