In the end of the 1980s, one of Madonna's songs was honored by Billboard magazine as the "Dance Single of the Decade". What song was it?

Explanation

"Into the Groove" is a song by American singer-songwriter Madonna from the 1985 film "Desperately Seeking Susan". It was featured on the 1985 re-issue of her second studio album, "Like a Virgin", and released on July 23, 1985. During an interview with Time, Madonna said that she wrote the song while watching a Latin boy across her balcony. The song was a commercial success and by the end of the 1980s, "Into the Groove" was honored by Billboard magazine as the "Dance Single of the Decade".