There are so many now. Different styles themes, etc. And I honestly can't decide which one I like the most since they all are amazingly good. The music department is the one part from Riot that has never ever miss its mark and expectations. Which ones do you enjoy the most ¿ Which one do you think its the best ¿
Azir. The Rise of the Ascended music is truly inspiring and fits perfectly as Shurima's anthem.
Sounds Steampunk AF
The violin part is impressive imo
Because it perfectly translates both personalities of Lamb and Wolf with respectively the Piano and the Contrabass
Do I really need to explain?
Just the happiest and most inspiring theme.
I could go on with a good half the the game's themes. All are very good in their own ways.
That's a hard one. There are so many good ones. In no particular order:
Vi
Ornn because of the humming and constant hammer hits. Irelia, Jhin, Kindred, Taliyah and Neeko are beatiful too
Champions: Vel'Koz, he just brings me nostalgia and is awesome. Close second in Kindred and Taliyah (love the soundtrack as much as the enviroment they're betraying)
Events: Gonna sound like a weeb but Star guardians vol.2 takes the cake for me. Loved the song and visulas + the 3d effect was a very nice touch. My 2nd fav. would be the 1st star guardian theme - instrumental version (i genuinely enjoy it more than the one with vocals).
Yeah, I enjoy League music quite a bit.
If they had made Nunu "it's me and you" a login screen I would have never skip it.
But two of my fave are Quinn and DJ Sona Ehtreal
It's really hard to decide so ill give you my top 5
My top favorites at the moment, roughly ordered from best to least liked.
or 
& 
(God-King Garen)
(Both of them)
Camille Mecha Sion Pulsefire Caitlyn
(Eclipse) 
(Pulsefire) 
and the third Project login, starring Project .
