Instruct: Classify a given Amazon review as either positive or negative.
Query: Three Bach Keyboard Concertos by Glenn Gould

The late Canadian pianist Glenn Gould was a master interpreter of Bach's keyboard music. These concertos were written for the harpsichord but Gould makes a compelling case for the modern piano. It doesn't hurt that he plays them on one of the most beautiful Steinway pianos I have ever heard. The big, fat, round tone of this instrument is breath taking. The first concerto in D-minor sounds like it was composed on graph paper instead of music paper, but Gould makes it sing and dance. The fifth concerto in F-minor usually sounds heavy on a piano, but Gould makes it float on air. The slow movement here was used by Gould as the music for the alien visitors in the movie "Slaughterhouse Five."