That's awesome you're sharing your love of music!
I have to disagree, though. There is tons of great music from all genres coming out all the time, you just have to find it because the industry has changed so much.
Your Old Droog, Louis Cole, Kamasi Washington, King Gizzard, Viagra Boys, Oh Sees, Deerhoof, Mdou Moctar, Czarface, Parquet Courts. These are just a handful of random modern acts off the top of my head who are putting out great music.
Hell, plenty of talented artists from the 90's (and other decades) like De La Soul and Beck are still releasing quality albums.
Maybe think about discovering new music as a bonding experience you can share with your kid.
Some newer headphones, like the Samsung Galaxy Buds 4 Pro that I just got, have 360 audio with head tracking. So, if you turn that on while you're upright, then lay down, the audio should compensate for your movement.