Library music, a.k.a. stock music or production music, is made to be potentially used in movies, shows, commercials, documentaries, etc. and was originally sold only to production companies, not to the public. In other words, it's a library of music that editors can choose from, instead of paying a composer to score specifically for the production. Since so many people are now interested in listening to the music for its own sake, the library record labels have uploaded a lot of their catalogs from the original tapes to YouTube officially. Before, we just had vinyl rips. A lot of those records were thrown out in the '90s, and that's when the public started getting their hands on them.My two favorite library labels are KPM and Bruton Music, so my playlist has more of them than anything, but there is also Music De Wolfe, Sonoton, Themes, Parry Music, Omnimusic, Amphonic, Chappell, NFL, Capitol, Tele Music, etc. I've also included a few Muzak tracks, which is not library music, but it fits the vibe. Any "elevator music" is often called Muzak, but it's actually the name of a company that sold instrumental music to businesses to be played in public places and workplaces. Seeburg is another company that did that. Muzak and Seeburg often did instrumental versions of popular songs in addition to their original music. It used to be everywhere and I wish it would come back.Library music covers every style and mood; classical scores, jazz, easy listening, rock, funk, synth, ambient, folk, etc. It's usually instrumental, but sometimes there are even whole songs with words. It's like a parallel universe to all other music. Those labels each had like 50 composers and producers churning out music all the time, so it's basically an infinite rabbit hole to explore. I love this stuff, obviously not all of it, but a lot of it. While I like a variety of moods in music, I tend to like happy music the most, so that is mostly what is in my playlist.