MUSIC/SP
From Computer History Wiki
MUSIC/SP is an Operating System for the IBM 370 class mainframe. Developed at McGill University in Canada, MUSIC/SP is more popular for its inclusion of TCP/IP into the Base Operating system.
The main MUSIC/SP homepage can be found here: http://canpub.com/teammpg/de/mcgweb/msi/musicsp.htm
MUSIC/SP can run on the following emulators: