The melody of I Heard The Bells On Christmas Day by Casting Crowns runs 295 notes across 46 bars, 4:17 long in Eb at 72 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 Heard The Bells On Christmas Day chords and lyrics.