The title does indeed not make much sense, but I imagine OP is trying to ask: "What grown up music did you listen to that you, and not a grown up, put on."
Answering that question, the first artists I remember looking up and having on my phone/mp3 Player were 30 seconds to Mars, Foo Fighters, and Linking Park. The latter because it was all the rage when I first got into music, not because the songs were especially good.
I assume you're asking what was the first non kids music I listened to and picked out myself? Instead of listening to the Lion King sound track, my first CD was Boston's greatest hits.
In the mid 1970s, we could borrow cassettes from the library. I started with Neil Diamond “His 12 Greatest Hits”, then moved on to Electric Light Orchestra, Roxy Music, and Mike Oldfield.
Eminem curtain call. My grandma brought it for me having no idea what it was. I was listening to it for a few days before my mum was like wtf is that and then listened to the first song on the album which was fack. I was 9 or 10 and she confiscated it and I had to steal it back and rip it to the computer and create copies incase she got those.
I remember making back up's of songs I liked that had swearing in them when i was like 8 in case my mom found them. I think I had like 5 or 6 copies of Damnit by Blink 182 hidden in my folder on the family computer, which had an 8gb hard drive.
One of the first albums I purchased was Back in Black by AC/DC. I also purchased a compilation album called Certified Gold. About half the songs on that were good, I remember liking a Pat Benatar song.
Before that I remember having a little portable boombox with cassette recorder and I recorded Dirty Deeds Done Dirt Cheap also by AC/DC and Destroyer by The Kinks. I listened to them over and over.
Found my parents "Business as usual" - Men at work vinyl.
Memorized "Down Under" listening with Sony DR-S5s. I always thought that's how you were supposed to listen since the cord matched the one on the album cover.
My first album was the self titled Gorillaz. If you put it in a computer there was a game!
I'd been listening to my older brother's music for a while before that though - Green Day Dookie, Blink-182 Enema of the State, Weezer Blue Album, Korn Issues were all in the mix.
My parents were young so I never had kid music. I listened to their stuff. The earliest I can recall I had 45s and albums in my room: Three Dog Night, Eagles- Hotel California, Paul Simon - 50 ways to leave your lover on 45, the soundtrack to Saturday Night Fever. I had several Beach Boys albums, and The Bay City Rollers album whichever one had Saturday Night on it. Oh, and KISS Double Platinum.
The first CD I ever owned was O zone - Dragon Sta Din Tei aka the Numa Numa song. No idea why or where I got it from but I would listen to that on my little cd player
Gorky Park - Bang (yeah I'm old). My brother got the vinyl delivered, and taught me how to put it on on his fancy vinyl player that automatically played both sides of a record.
The first song I remember liking was Gorky Park - Bang. My brother had just gotten it on vinyl, and I have a faint memory of him putting it on for the first time in his fancy vinyl player that would automatically move the needle to the under side when it was done playing. He taught me how to put it on on the living room player.
I loved playing with my bigger sister's cheap hi-fi, I would put on a vinyl record and without power turned the record manually save heard whispering ^(🎵cherry cherry lady...🎶), so there's Modern Talking, then when she bought a CD player it was Crush by Jennifer Page