
In each succeeding millennium, life becomes increasingly sedentary and automated: thoughts are pre-programmed into pills for people to consume, eyes, teeth, and limbs all lose their purposes due to machines replacing their functions, and marriage becomes obsolete because children are conceived in test tubes. The following verses pick up the story at 1,010-year intervals from 3535 to 6565. "In the Year 2525" opens with an introductory verse explaining that if mankind has survived to that point, they would witness the subsequent events in the song. Another single, "Listen to the People", managed to make the bottom slot of the Cashbox chart at number 100 and number 96 in Canada. Turnkey", reached #48 in the Canadian pop charts and #41 in the Canadian AC chart. Their follow-up single on RCA Victor, "Mr. Billboard Hot 100 and the UK Singles Chart and as of 2021, they are the only recording artists ever to have a chart-topping #1 hit on both sides of the Atlantic and never have another Billboard charting single in the US or the UK for the rest of their career. Zager and Evans were a one-hit wonder, never releasing another charting single.

The song was written and composed by Rick Evans in 1964 and originally released on a small regional record label (Truth Records) in 1968. It peaked at number one in the UK Singles Chart for three weeks in August and September that year. It reached number one on the Billboard Hot 100 for six weeks commencing July 12, 1969.

" In the Year 2525 (Exordium & Terminus)" is a 1969 hit song by the American pop-rock duo of Zager and Evans.
