4: Song excerpts from covers of “Hallelujah” by Jeff Buckley, Pentatonix, and Regina Spektor.

Source: 

Sources: Buckley, Jeff. Grace. Columbia Records. 1994.

Pentatonix. “A Pentatonix Christmas.” RCA Records, 2016.

Spektor, Regina. “Regina Spektor - Hallelujah (Leonard Cohen cover 2005) indie pop anti folk.” YouTube video, 5:32. Posted March 2015. https://www.youtube.com/watch?v=Sra2OGlbsHQ