You’re A Mean One, Mister Grinch by Glee Cast is in Gm at 100 beats per minute and runs 1:58 across 42 bars. It uses 14 chords — Dm, G7, C, F, D7, E7, A7, N.C., and a few more. The chord diagram changes as the song plays and the words light up as they are sung, so you can strum and sing along without reading ahead.
Want the melody line note by note? You’re A Mean One, Mister Grinch guitar melody tab.