Rhapsody but it costs money, it's worth it tho. Don't remember how much I'm paying, I think like 60 dollars a year for unlimited music and everything. Shows related/similar artists or albums to whatever you're listening to. It's really cool tho.
My music taste is really diverse, I started out loving the Beatles like 5ish years ago and then like 2 years later my dad, who really loves music, has a taste for everything and always has an opinion, wanted me to go listen to The Clash, so I did and I was fucking hooked. I listened to them for probably 6 months straight, nothing else. And the Clash are a very diverse group, they played ska, reggae, dub, punk, they had a gospel track on one their albums, and a ton of other stuff. But somebody who was involved with the Clash, a reggae producer/artist named Mikey Dread, opened my eyes to reggae, and I was looking through all these reggae artists having the time of my life, and then after that I found a reggae act that I liked was involved with The Specials (ska) and then I found some cool post-punk stuff (The Stranglers, Gang Of Four, Joy Division) and then some sweet funky stuff (Talking Heads) and it all just branched off from there. A lot of it came from just surfing YouTube by searching up a song, listening to it, and then once it was finished I would look in the related box and find something that I thought might be good and listened to that, either that or look through Rhapsody.
but yeah it's always good to expand your musical horizons.