"Should've Known Better" is a song written and performed by American pop-rock singer Richard Marx, and released in August 8, 1987 as the second single from his eponymous debut album. The song peaked at number three on the US Billboard Hot 100 as well as #7 on the Billboard Mainstream Rock Tracks chart in 1987.

Marx became the first solo artist in recording history to reach the top three of the Billboard Hot 100 with four singles from a debut album. How about today?