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Psychedelic rock reached its apogee in the last years of the decade. The Summer of Love of 1967 was prefaced by the Human Be-In event and reached its peak at the Monterey Pop Festival, the latter helping to make a major American star of Jimi Hendrix. Key recordings included Jefferson Airplane's "Surrealistic Pillow" and The Doors' "Strange Days". These trends climaxed in the 1969 Woodstock festival, which saw performances by most of the major psychedelic acts, but by the end of the decade psychedelic rock was in retreat. The Jimi Hendrix Experience and Cream broke up and many surviving acts moved away from psychedelia into more back-to-basics "roots rock", the wider experimentation of progressive rock, or riff-laden heavy rock.