Hard To Say I’m Sorry by Chicago is in E at 80 beats per minute and runs 2:57 across 40 bars. It uses 17 chords — E, A, B, G#, C#m, F#, G#m7, F#m7, 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? Hard To Say I’m Sorry guitar melody tab.