According to Ira Gitler in The Masters of Be-Bop, the overdubbing and tape speed manipulation on this album unleashed a furor. Tristano had begun experimenting in 1951, when he had additional piano tracks, some of which had been speeded up by engineer Rudy van Gelder, added to his recording of the songs "Ju Ju" and "Pastime". Tristano later recalled that not a single reviewer questioned the multitracking of those songs. According to Tristano, questions began to arise six months to a year later. At the time, Tristano declined to discuss it. In an interview years later, he described a private incident where Leonard Bernstein and Willie Kapell debated the topic in his home. After Bernstein declared his certainty that the songs were multitracked, Kapell demonstrated that the speed was possible by playing a Mozart tune 16 times faster than it would generally be played.
