
Turnkey", failed to chart in the US and UK, as did subsequent releases. Despite the success of "2525" (it was even nominated for a special Hugo Award), the follow-up single, "Mr. Zager and Evans are considered to be the prototypical one-hit wonder artists. In Italy, the duo released an Italian version on RCA Victor 1583: "Nell'anno 2033" b/w "Donna" ("Woman"). "In the Year 2525" remains popular on oldies stations sales of the original hit recording, including singles sales, album usage and compilation inclusions, are estimated at over ten million worldwide. Zager and Evans also immediately recorded an album of the same name, again using Trupp and Dalton as the primary rhythm section. After radio stations in Lincoln and Omaha made "2525" a regional "break-out" hit record, RCA Records signed the duo and released the song with "Little Kids", also written by Evans, as the B-side nationwide.

"2525" was originally written in 1964, but not recorded or released until 1968 on the Truth Records label. The record sold over four million copies by 1970 and was awarded a gold disc by the Recording Industry Association of America (RIAA) in July 1969.

"2525" topped the charts at the time of two major cultural events: the first moon landing on Jand the Woodstock Music Festival a month later.

"In the Year 2525" hit number one on the Billboard Hot 100 in 1969, ultimately claiming the top spot for six weeks. The last stanzas of the song suggest mankind undergoes a continuing cycle of birth, death, and rebirth. Written by Evans, "In the Year 2525 (Exordium & Terminus)" warned of the dangers of technology, portraying a future in which the human race was destroyed by its own technological and medical innovations.
