Instruct: Classify Amazon reviews into positive or negative sentiment
Query: 15 stars, really.

A spectacular album with Borah Bergman and Andrew Cyrille in prime form. Cyrille, as usual, is an acute listener and responds, anticipates and accompanies Bergman with uncanny imagination and drive. Borah Bergman -- perhaps the greatest , most under-recognized musician of the last 30 years. An incredibly powerful pianist, second only to Cecil Taylor, with a left hand that surpassed all. Here he sounds like 2 pianists at once; the wealth and density of contrapuntal, intertwining musical thought on a level no one (other than Taylor) has ever achieved. And as soulful as it gets -- an emotional openness as expansive as the open prairie. Genius musicianship, straight no chaser, no compromise. (As Bergman once described his approach, "It's comin' at ya and if you don't like it shove it up your azz.") Music for those who demand only the best and can handle (i.e., enjoy) it. Re 15 stars: 5 for Cyrille, 10 for Bergman, who plays like 2 pianists, brilliantly.