"Happenings Ten Years Time Ago" is a song by the English group the Yardbirds. Written and recorded in 1966, it is considered one of their most progressive works. The song was the group's first to feature the dual-lead guitar line-up of Jeff Beck and Jimmy Page. The two contribute an array of guitar parts during the instrumental sections, described as "a full-on six-string apocalypse". Lyrically, it deals with notions of past life and déjà vu. The song was released as a single to mixed reviews and was less successful on the record charts than the group's previous efforts. More recently, it has been acknowledged for its inventiveness and contribution to the early development of psychedelic music. Several elements have influenced songs by other musicians. Background "Happenings Ten Years Time Ago" came about in the period after Yardbirds' founding member and bassist, Paul Samwell-Smith, left the group to pursue record production full-time. In June 1966, he was replaced by studio guitarist Jimmy Page, who agreed to serve as bassist until rhythm guitarist Chris Dreja gained some proficiency on the instrument. The Yardbirds maintained a heavy schedule of live appearances that coincided with the release of their latest single, "Over Under Sideways Down". Page recalls that he had become stifled with studio work and by playing live with the Yardbirds, even though on bass, he was able to come up with new ideas when he returned to the guitar. During their American tour in August and September, the Yardbirds' lead guitarist Jeff Beck experienced health and personal issues. For the shows that he missed, Page took over on lead, while Dreja switched to bass. When the group returned to the UK, Beck and Page became co-lead guitarists, with Dreja as the full-time bassist. With the line-up change also came a shift in musical styles. The group had already gone through one change, when they moved beyond the repertoire of older American blues and R&B songs then in fashion among the early beat and British rhythm and blues groups (and prompting guitarist Eric Clapton to leave the group). With two lead guitarists in the group, the Yardbirds explored a different approach. Rather than trading solos while the other played rhythm guitar, Page explains: Beck's and Page's guitar interplay also resulted in the music getting "heavier", as heard in parts of "Beck's Bolero", the instrumental recorded by the two five months earlier for a