Light Music
From Wikicliki
Although the programme became very popular with domestic audiences and later with motorists, it was aimed first and foremost at the factories, and strict rules were applied: predominately familiar pieces, nothing lethargic, consistent volume, avoidance of overloud drumming (which could sound like gunfire), and generally cheerful programmes to which workers could whistle or sing. Jazz was discouraged as, by its very nature, it often deviates from the melody, which had to be clear at all times.
Philip Glass - Facades