Regular Water

Try bazzite if you are willing to learn, otherwise just pick Zorin OS or Linux Mint and you will be fine (You will just have to learn the basics of how linux works, but nothing too complex as arch linux)

I’m old fashion, I put the synchronised subtitles on the mp3 files manually as a hobby, using Musicolet on Android, but I can see why is not a thing anymore

I think its almost perfect, just need a plugin to be able to show lyrics synchronised with the song