MSK stands for Martin, Schneider and Kajeski, who owned M-S records, Detroit.
Chester J Kajeski owned the music publisher Chetkay, that published the Silky Hargraves tracks
(DBA CHETKAY Music Pub, 15401 Tirman, DEARBORN, MI)
Kool Kat records were a division of MSK productions, Detroit
Martin & Schneider also owned Marquee records, distributed by MSK productions.
Marquee & Dearborn were run out of the same building in Dearborn
M-S, Dearborn, Kool Kat & Marquee all have songs on them licensed from Chetkay