How did you blur the windows/make them transparent?

Check out Armcord. It’s a 3rd party client with many customization choices (mainly due to the fact that it bundles Vencord and Shelter client mods).

Which TED talk are you talking about? Can you post a link?

Renoise is an excellent tracker-based DAW with Linux support (you still have to find Linux-compatible VSTs though). It changed the way I write music.

EDIT: I know there are FOSS trackers like MilkyTracker. If you want an alternative, I can recommend it, even though it doesn’t offer the same amount of features as Renoise (e.g. VST or effect support).

I use ListenBrainz for a libre alternative.