Now there is music from which a man can learn something.- W. A. Mozart (on hearing Bach motets in Leipzig)
In the multiverse I'm supremely happy that I've ended up in one where Bach both existed and created tremendous amounts of music. You can spend a lifetime exploring his oeuvre and find entire corners of delight.
I'm reminded of this thread from 2014: https://news.ycombinator.com/item?id=7720708
Despite appearances to the contrary, I find that one of the powerful things about Bach's work is how it is almost a kind of "abstract" auditory form that just happens to be performed on instruments. What I mean is that many of his pieces can be performed equally well on just about any combination of instruments or voice and still be beautiful. It's not always true, but there's a strange density of his music that seems like this.
https://www.youtube.com/watch?v=-zkPaGnKb5M
https://www.youtube.com/watch?v=8BvwM07BYvg
https://www.youtube.com/watch?v=XKRj-T4l-e8
Some favorites:
https://www.youtube.com/watch?v=QLj_gMBqHX8&t=353s (BWV 1048 III Allegro)
https://www.youtube.com/watch?v=eWlfmepsUuQ (BWV 1049) - the reason why the Recorder has value as an instrument
https://www.youtube.com/watch?v=tc4kWmxpZGs (BWV 1060) - Every note the Oboe plays is made out of magic and delight here.
https://www.youtube.com/watch?v=CexJQ8VWJfY (BWV 1051) - Even Violas can be beautiful, and this is one of the most incredible pieces of music in all of music.
I think the next composer to have captured my attention has been Steve Reich. And for entirely different reasons. I can take or leave his earliest highly experimental works. But when he came into full form later on he created majesty. Some of this music feel like being inside the engines of creation. You'll find his fingerprints all over modern music.
https://www.youtube.com/watch?v=4Np9yApXD94
https://www.youtube.com/watch?v=PMsYuFrKUQ8
https://www.youtube.com/watch?v=mLZelvSvh3A