We bought a portable CD player/Boombox for our then 7 year old (she’s now 10).
She loves digging through all our old CDs, she buys her own CDs for 50p/£1 in charity shops, I burn her the occasional mix cd.
She’s discovered a lot of music that she probably wouldn’t have found on Spotify, etc. and she’s definitely got a more eclectic and interesting taste in music now compared to a lot of her peers.
I also like the physicality of it, she has to choose to listen to things rather than being a passive listener, just following the algorithm’s suggestions.