Chicago Mastering Service is a full-service analog and digital audio mastering studio.

An etched series of numbers identifies the date the master lacquer was cut in the format of YYMMDD

Do not add date as a catalog # to LCCN.

e.g. 080929 - Sep 29, 08 (usually found behind a "lying Y" in a circle (Ⓨ, rotated 90° to the left), as in their logo, and the engineer's initials).
Use [CMS logo] when adding this to the BaOI.

Mastering engineers known to have been employed at Chicago Mastering Service:

Jason Ward [JW]
Robert Weston [BW]
Shelly Steffens [SS]
Matthew Barnhart [MB]
Margaret Luthar [ML]
Greg Obis