of Europe in August–September 1968, playing alongside the Doors in the Netherlands, England, Germany, and Sweden. In a notorious incident at a concert in Amsterdam, while the Airplane was performing "Plastic Fantastic Lover", Doors singer Jim Morrison, under the influence of a combination of drugs fans had given him, appeared on stage and began dancing "like a pinwheel". As the group played faster and faster, Morrison spun around wildly until he finally fell senseless on the stage at Balin's feet. Morrison was unable to perform his set with the Doors and was hospitalized; keyboardist Ray Manzarek sang all the vocals. It was also during this tour that Slick and Morrison allegedly engaged in a brief sexual relationship, described in Somebody To Love?, Slick's 1998 autobiography. Jefferson Airplane's fourth LP, Crown of Creation (released in September 1968), was a commercial success, peaking at No. 6 on the album chart and receiving a gold certification. Slick's "Lather", which opens the album, is said to be about her affair with drummer Spencer Dryden and his 30th birthday. "Triad", a David Crosby composition, had been rejected by The Byrds because they deemed its subject matter (a ménage à trois) to be too "hot." Slick's searing sexual and social-commentary anthem "Greasy Heart" was released as a single in March 1968. A few tracks recorded for the LP were left off the album but later included as bonus tracks, including the Grace Slick/Frank Zappa collaboration "Would You Like A Snack?" The Airplane's appearance on The Smothers Brothers Comedy Hour in the fall of that year caused a minor stir when Slick appeared in blackface (she claimed she simply wanted to wear all the makeup she saw in her dressing room) and raised her fist in the Black Panther Party's salute after singing "Crown of Creation". In November 1968, the band played "House at Pooneil Corners" on a New York City rooftop. It was filmed for D. A. Pennebaker movie 1 PM. The concert was stopped by the police just like the Beatles' famous rooftop concert about two months later, as depicted in the 1970 documentary Let It Be. In February 1969, RCA released the live album Bless Its Pointed Little Head, which was culled from 1968 performances at the Fillmore West on October 24–26 and the Fillmore East on November 28–30. It became the Airplane's fourth Top 20 album, peaking at No. 17. Hot Tuna began