What was the first single by new wave band Blondie to reach the UK Top 10?

Blondie is an American rock band co-founded by singer Debbie Harry and guitarist Chris Stein. The band was a pioneer in the American new wave scene of the mid-1970s in New York. Their first two albums contained strong elements of these genres, and although highly successful in the United Kingdom and Australia, Blondie was regarded as an underground band in the United States until the release of "Parallel Lines" in 1978.

"Denise" is a song written by Neil Levenson that was inspired by his childhood friend, Denise Lefrak. In 1963, it became a popular top ten hit on the 'Billboard' Hot 100 chart, when recorded by the American doo-wop group Randy & the Rainbows. American group Blondie, re-titled the song as "Denis".

"Denis" (using the masculine form of the name in French, with a silent "s") is a 1978 cover of the song by the American new wave band Blondie. This effort helped the band break into the international market. It was featured on the band's second studio album, "Plastic Letters" (1978), and was the second UK single release by Blondie on Chrysalis Records. "Cash Box" said it has "recognizable thrashing guitar licks, kick drumming and Deborah [Harry's] bright vocals."

"Denis" was released in February 1978 and reached number 2 in the UK (the band's first UK Top 10 single) and broke into the Top 20 in most European countries, including number 1 in Netherlands.