Posted over on the Steve Hoffman forums:
Downbeat Magazine, 1966
In a surprise move, tenor saxophonist Joe Henderson abruptly quit the Horace Silver Quintet in the midst of the group's performance before a Saturday night crowd at San Francisco's Jazz Workshop on April 2, 1966.
Silver told Down Beat that the tenorist's reported reason for leaving was that drummer Roger Humphries' playing "was thwarting his solos." The pianist's group finished the Saturday night and played the following afternoon and evening performances as a quartet. Altoist Frank Strozier, who was "borrowed" from the Shelly Manne group in Los Angeles, substituted for Henderson through Silver's April 10 closing.
The pianist, who said he did not plan to bring union charges against Henderson, indicated he would add a new sideman upon returning to New York City. Silver said he had no intimation Henderson was planning to leave, though the tenor saxophonist had asked the leader for a three-month leave of absence to form a recording group some months earlier. At that time, Silver refused on the grounds that by the time a replacement was taught the group's library, Henderson would be due to return. Asked then if he wished to leave, Henderson elected to remain.