Final answer:
The Gavin Report is not known to have had a direct impact on psychedelic music. Instead, unpredictable cultural phenomena like Woodstock and the counterculture movement in the late 1960s propelled psychedelic music to widespread popularity and commercial success.
Step-by-step explanation:
The student question seems to involve an understanding of the impact of a particular report on psychedelic music. However, there appears to be a mix-up because the "Gavin Report" itself is not directly associated with psychedelic music or its hits. Instead, what can be discussed is the cultural and societal context within which the psychedelic movement flourished. The late 1960s and the early 1970s, an era with icons like Jim Hendrix and Janis Joplin, saw the rise of psychedelic music to widespread popularity and commercial success, greatly influenced by the counterculture movement. Events like Woodstock in 1969 exhibited the pinnacle of the counterculture and psychedelic era, with participants openly using substances such as LSD, as described in Glenn Weiser's account. The era's music and the counterculture movement reflect a profound shift in American culture, characterized by a rebellion against conventional norms and an exploration of alternative lifestyles, including the use of psychedelic drugs. The counterculture movement, including the Beatniks and later the hippies, created an alternative ethos that eventually permeated mainstream culture, influencing music, art, and even political policies. Despite eventually facing pushback and leading to governmental actions against substance abuse, the movement's influence on culture and music had a lasting impact.