 " Eight Miles High " reached number 14 on the Billboard Hot 100 chart and number 24 in the UK Singles Chart . The song was also included on the band 's third album , Fifth Dimension , which was released on July 18 , 1966 . " Eight Miles High " became the Byrds ' third and final U.S. Top 20 hit , and was also their last release before the departure of Gene Clark , the band 's principal songwriter at the time . 
