Should’ve Known Better by Richard Marx is in Fm at 120 beats per minute and runs 5:16 across 63 bars. It uses 15 chords — Fm9, Abmaj7, Bb, Cm7, Eb, Ab, Ebsus, Bbsus, and a few more. The chord diagram changes as the song plays and the words light up as they are sung, so you can strum and sing along without reading ahead.
Want the melody line note by note? Should’ve Known Better guitar melody tab.