May 7, 1966 –
The Mamas and the Papas song Monday, Monday reached no. #1 on the Billboard charts (their only no. #1 hit) on this date.
This was the first Hot 100 chart-topper with a day in the week in the title, and the only one with “Monday.” (Manic Monday by the Bangles and Rainy Days And Mondays by the Carpenters both stalled at #2.
The Haus of Dcaligari 