The beginning of the millennial generation fits in with “over 35” by some definitions. I am slightly over 35.
I used to listen to almost all stuff that came out before I was born, being heavily biased by the radio choices of my parents. When I was a kid, I thought modern music of the time was mostly absolute garbage in comparison, but I later came to realize that was because the classic rock stations were playing all the greatest songs and modern stations were playing whatever was new, whether it would stand the test of time or not.
Anyway, I eventually got Pandora, and I listened to The Who, Led Zeppelin, Yes, Pink Floyd, Rush, and discovered a bunch of new stuff by those kind of artists I hadn’t heard before and was introduced to new-to-me music that happened to come out in the same time period. But one time Pandora played this weird instrumental that was really heavy metal-based by an artist I never heard of (Epica), and I thought it was kinda cool. So I made a station based around it, and then suddenly there was a whole genre of music I never knew existed that I liked a lot - symphonic metal. It was all new-to-me, and it was all much newer than what I listened to, but when I looked up when it came out, it was normally several years in the past.
I ended up finding various other genres of music this way: epic trailer/soundtrack stuff typified by Two Steps From Hell, violin/cello artists like Lindsay Sterling, Celtic fiddling from artists like Natalie MacMaster, and Spanish guitar from guys like Armik. How new is any of it? Eh, not too much. But it’s all new-to-me and it’s nothing that I would ever have heard on a preset radio station. There are no Sirius XM stations dedicated to anything like those genres. If I want symphonic metal, I would have to go to the metal channel that’s most likely to play it. Which one? I have no idea. If I want Spanish guitar, maybe there’s a Latin station that sometimes plays it, but I’m not going to try to find out. I’m just going to keep using Pandora, which will bring new stuff to me that I never would have realized existed without it.
As to life music, I’ve been to two Natalie MacMaster concerts, and at neither one did she play a single tune I had ever heard before. They weren’t bad and I didn’t pay for them, but they reinforced my view that live music will tend to be mixed very badly compared to studio recordings. I also managed to get someone to pay for me to see 2Cellos, and they did play exactly what I had listened to on Pandora (and even some heavier stuff), but I again was generally left with the feeling that if I had paid for the concert I would have been better off spending money on an equivalent number of studio recordings that I could listen to countless times.
All of my physical library of music gets play in one very specific circumstance that doesn’t come up very often, so my old collection of mostly classic and prog rock gets minimal ear time (outside of when I’m in the car with my mother) and keeps its luster. In my car I listen to CDs that have 700 megs of MP3s on them, played on shuffle, and it’s something like having my own “top 100” station on a certain theme where if I get tired of the music I just switch it out for another CD with an entirely different set of 100 or so songs.