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Psychedelic rock reached its apogee in the last years of the decade. In America the Summer of Love was prefaced by the Human Be-In event and reached its peak at the Monterey Pop Festival, the later helping to make major American stars of Jimi Hendrix and The Who, whose single "I Can See for Miles" delved into psychedelic territory. 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 broke up before the end of the decade 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.