The melody of What Child Is This? by Josh Groban runs 264 notes across 126 bars, 3:39 long in Gm at 148 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? What Child Is This? chords and lyrics.