MUSIC/SP
From Computer History Wiki
MUSIC/SP is an operating system for the IBM System/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: