The beat is a mix of one repeating bar of Nickleus’ Thin Line Drum Beats (pitched up 4 steps) on top of repeating pattern of 4 bar samples of Martijn de Boer’s Cold Pimp Man drums (pitched down 4 steps). Repitching reconciled Pimp drums’ G# kick and Thin Line’s C kick within an Em song.

Attribution:
God Rest Ye Merry Gentlemen performed by Diyan is licensed public domain and courtesy of librivox.
https://archive.org/details/christmas_carols_2006_librivox/03_godrestyemerry_dy.mp3