"Happenings Ten Years Time Ago" is a 1966 song by the English rock band the Yardbirds. It encompasses the musical genres psychedelic rock,psychedelic pop, and has been described as a prototype of heavy metal music. With special effects and dual lead guitars by Jeff Beck and Jimmy Page, it was considered groundbreaking for the time. However, it only made a modest showing in the record charts and ended the group's six Top 20 singles run in the UK and US

The Yardbirds recorded "Happenings Ten Years Time Ago" after the sessions for Yardbirds (a.k.a. Roger the Engineer (UK) and Over Under Sideways Down (US)). Paul Samwell-Smith, founding member and bassist, left the group in June 1966 to pursue record production full-time and was initially replaced by studio guitarist Jimmy Page.

However, by "Happenings Ten Years Time Ago", Page joined Jeff Beck as a co-lead guitarist. Rhythm guitarist Chris Dreja switched to bass, although for the recording session musician John Paul Jones plays bass. Beck, Page, and Jones had recorded earlier together for "Beck's Bolero" in May 1966.

"Happenings Ten Years Time Ago" reached number 30 on Billboard Hot 100 chart in the US and number 43 in the UK Single Chart. In a song review for AllMusic, Matthew Greenwald describes "Happenings Ten Years Time Ago" as

Led by a dark, Middle Eastern/psychedelic guitar riff, the song is quickly transformed into a frenetic, almost psychopathic rhythm, giving the whole affair a weird and powerful atmosphere. The idea of going back and forwards into time is paramount here, and was certainly one with the overall psychedelic ambience of the time.

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