Here's a bit more info on the Evans/Getz blowup over the blues from the Bill Evans website:
The concert series of 1974 Laren International Jazz Festival was continued with a performance by the Bill Evans Trio with Stan Getz. (Stan Getz, tenor saxophone; Bill Evans, piano; Eddie Gomez, bass and Marty Morell drums). Producer Joop de Roo still remembers very well how everything went wrong: In the studio in the afternoon everything went reasonably, although the problem remained as to exactly what changes should be played in the blues. Eventually it was decided not to play any blues at all. In the evening Bill Evans started off all right until Stan appeared and blatantly started an unannounced, unrehearsed blues, "Stan's Blues". Evans refused to go on playing and the whole set lasted only 25 minutes. The concert which they gave a week later at the Middelheim Jazz Festival, Antwerp in Belgium, on the other hand was exceedingly good. Released as album title: But Beautiful (Milestone records).