I use apple music. On linux I use Ciderwhich is amazing. Super clean interface and lots of nobs to turn in order to make everything sound and behave the way I like. If you like apple music or are looking for a streaming solution cider is awesome.
I’ve used StandardNotes for years. They are great, very privacy friendly and lots of good features. I’ve also used Obsidian like others have mentioned but I didn’t use 95% of the features on either standard notes or Obsidian – now days I just use a general markdown files and store them in a git repo – low complexity and I like the simplicity of it. 100% recommend.