Effective period / Period of releases: 1988 - 1990

From link below:
Robert Mathieson was Pipe Major of the famous Shotts and Dykehead Pipe Band from 1986 to 2010. During that time, he he led the band to 30 Major Competition Championships, including 5 world-titles. His renowned creativity, compositional prowess, and partnership with the great Jim Kilpatrick has earned him a reputation for being one of the world's foremost authorities on issues of ensemble, integration, and overall pipe band musical performance.