> What has a Linux GUI but no Windows app or alternative?
I don't know about alternatives (it seems Cubase is a proprietary one), but Rosegarden [1] is a GNU/Linux "audio and MIDI sequencer, scorewriter and musical composition and editing tool" that does not seem to have a Windows build (a maintained one anyway). It's a great app, I guess it could convince a musician to use Linux for some music-related activities.
I don't know if it runs (well) in WSL (1 or 2).
Rosegarden aside, I'm not sure there is a single app I use regularly that absolutely can't run on Windows (some can run on Windows (and Mac), but probably run way better on GNU/Linux, like the Kate editor, and Clementine seems to have a spotty Windows support too).
I don't know about alternatives (it seems Cubase is a proprietary one), but Rosegarden [1] is a GNU/Linux "audio and MIDI sequencer, scorewriter and musical composition and editing tool" that does not seem to have a Windows build (a maintained one anyway). It's a great app, I guess it could convince a musician to use Linux for some music-related activities.
I don't know if it runs (well) in WSL (1 or 2).
Rosegarden aside, I'm not sure there is a single app I use regularly that absolutely can't run on Windows (some can run on Windows (and Mac), but probably run way better on GNU/Linux, like the Kate editor, and Clementine seems to have a spotty Windows support too).
[1] https://rosegardenmusic.com/