The melody of I Promise by CeCe Winans runs 236 notes across 43 bars, 3:37 long in Bb at 74 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? I Promise chords and lyrics.