Surprised to see it’s not mentioned here. 24 years old internet radio, still kicking, over 30 channels with hand-picked playlists, almost all of them suitable for concentration. They are sponsoring Def-Con for years. Owner has a great Fediverse presence.
Channels have very interesting concepts like Spy Jazz, Ambient over NASA’s mission broadcasts, Celtic Folk, Vaporwave, 80s Synthpop and my favorite SF 10-33 Ambient over San Francisco Police Radio live feed.
One thing no one will tell you HOW LOUD some HDDs could get under load. You may not want any of those disks around if you’re keeping your server around your living spaces.
Just check dB values in the spec sheets.