The melody of Chain Reaction by Diana Ross runs 587 notes across 57 bars, 4:04 long in B at 124 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? Chain Reaction chords and lyrics.