«It’s a Sin» is a song recorded by Pet Shop Boys which reached number one on the UK Singles Chart for three weeks in 1987.Written by Chris Lowe and Neil Tennant, «It’s a Sin» was the lead single from the duo’s second «proper» album, Actually. Released in June 1987, it became the duo’s second UK number one single. It was also a massive hit across Europe, supposedly the best-selling European single of 1987. In the United States it reached number nine on the Billboard Hot 100 chart, becoming the duo’s third Top 10 hit there. A demo of the track was first cut in 1984 with Bobby O, and the song’s form in the demo remained intact to the final version, although the released production is far more dramatic.