Songpsych
Episode 143: What’s the Point of Elevator Music?
Source 1: https://youtu.be/Yl3t2pjDYhQ?t=31
Source 3: https://assets.atlasobscura.com/article_images/56226/image.jpg
Source 4: https://i.pinimg.com/originals/eb/0a/75/eb0a7530e4fffc1e9f94835b5f792cd1.jpg
Source 6: https://i.pinimg.com/originals/7b/f9/cd/7bf9cd572a52446c9e7b2aa4384ed0f4.jpg
Source 7: https://allmandlaw.com/wp-content/uploads/2017/12/45900041b30fad87c7bf694fb61a0924.gif
Source 8: https://www.youtube.com/watch?v=vJILgLFl0e0&list=PLM8O9pSVThbaQue1NJalR8GX5rGCLKzES&index=3
Source 9: https://youtu.be/sCnHWZTLAOk?t=7
Source 10: https://youtu.be/Yl3t2pjDYhQ?t=28
Source 11: https://www.bloomberg.com/profile/company/14320Z:US
Source 12: https://www.citywide.io/news/elevator-music-history
Source 13: http://www.elevatorhistory.net/elevator-history/elevator-music/
Source 14: https://www.atlasobscura.com/articles/history-of-elevator-music
Source 15: https://www.press.umich.edu/8718/elevator_music
Source 16: https://www.wqxr.org/story/history-muzak-where-did-all-elevator-music-go/
Source 17: https://landmarkelevator.com/history-of-elevator-technology/
Source 18: https://youtu.be/kzFgoaZ9-VQ?t=539
Source 20: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4286616/