Hi lowpoint
I'd say that being "down" probably has everything to do with it from what you've said, and I am sorry that you've lost that connection with the music that really "reached you"

But you know with depression that sense of apathy or emptiness.........and the sense that some things don't feel as good as they could, don't taste as good as they could, don't look as attractive as they could...........then sometimes in depression/when you're really "down" it can sometimes it can take different things to "reach you".........and sometimes those things can be entirely different things than have "reached you" before...........or things that "reach you" on a different level, sometimes that might be more of what you need, to help you feel "connected" or to distract you slightly from.............so perhaps "go wild" exploring loads of completey different things, things you wouldn't otherwise have listened to..........
If you're not able to "connect" on one level to what you did...........then maybe on another level with something else............
And as you're working through the way you're feeling (with our help if you need it!!), or on a "better" day, then there's nothing to say that those "passions" won't return

Hang on in there, the "mostly Joy Division" and the exact way you felt about that music can still be waiting for you...........there is still a "tomorrow"..........but let's just work on today hey?? And if there's any support we can give you with the way you're feeling, you're not alone, we're here for you
And sending hugs
Alison