The melody of God Rest Ye Merry, Gentlemen by Glee Cast runs 358 notes across 102 bars, 3:22 long in Bm at 126 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? God Rest Ye Merry, Gentlemen chords and lyrics.