The melody of Colour My World by Chicago runs 53 notes across 14 bars, 3:02 long in Bb at 75 beats per minute. The tab sits almost entirely in the first two frets, one note at a time — no chords to barre and no strumming pattern to keep up with. A piano backing track plays the chords and bass underneath, so the line you are learning sounds like the record even at half speed.
Prefer to strum and sing it instead? Colour My World chords and lyrics.