Started with a digitized copy of a 1920 recording of Oh, Come, All Ye Faithful by Collegiate Choir published by Brunswick Records. After cutting around the heaviest scratches and pops, there remained about 45 seconds of vocals. Pitched the choir down 2 steps to match Admiral Bob’s vocals.

Cut and pasted Admiral Bob’s bass, Rhodes and voice to align with the choir. Cut, pasted and pitched down 5 steps a Librivox version of O Come All Ye Faithful.

Tangential note: The name Brunswick on the disc label sounded very familiar from too many years of barroom and pool hall adventures. This company, founded in 1845, still makes billiard tables. Among their many product lines, they established Brunswick Records in the 1910s and sold a controlling interest to Warner Brothers in the 1930s.

Attributions:
1. Oh, Come, All Ye Faithful by Collegiate Choir was published 1920-11. Audio recording published in the U.S. before 1924 are now in the public domain.
https://archive.org/details/78_oh-come-all-ye-faithful_collegiate-choir-portugal-rev-fred-oakley_gbia0059162a
2. O Come All Ye Faithful is public domain recording from the Librivox Christmas Carol Collection 2015
https://librivox.org/christmas-carol-collection-2015/