Colour My World by Chicago is in Bb at 75 beats per minute and runs 3:02 across 14 bars. It uses 12 chords — Fmaj7, Am, Bb, Ebmaj9, Abmaj7, Gbmaj7, D9, D7, 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? Colour My World guitar melody tab.