(Saturday, June 29, 1985) — “Into The Groove”” by Madonna peaked at #1 on today’s Billboard Hot Dance Club Play chart for one week.

While a very popular track at the time with heavy rotation on MTV, “Into the Groove” was only available as the B-side of the 12-inch single of “Angel,” and therefore not eligible to chart on the Billboard Hot 100 according to the rules at the time.