Muzak is functional music, around since 75 years. It affects those who hear it but doesn’t require a conscious listening effort. The key to Muzak’s effectiveness is “stimulus progression,” which offers a psychological “lift” to its listeners – a subconscious sense of progress/results achieved via fifteen-minute block soundbites.
Research on physiological/psychological effects of Muzak have shown that it increases the work rate metabolism, increasing or reducing muscular energy, fatigue and attention.
The Muzak corporation deliberately use popular music – pop, jazz and classical – in order to produce the impression of familiarity, which is underlines friendliness.