Hmmm... I saw this thread and some of the first replies earlier this morning, and I thought "interesting..." ... and it seems to have developed from there :lol:
I don't really know what sort of music you play Indy - so I feel uncomfortable suggesting anything for you... However, recently I've been using the Spotify website to play along with stuff that I feel like playing along with and would like to get better at.
Right at the moment this has been a lot of 60s pop music - it's what I grew up with and what formed my musical tastes, and it's very well covered on Spotify.
And I'm finding 60s pop songs extremely challenging! :lol: Although I grew up with it, it's not what I was listening to when I started playing in earnest - that was early NWOBHM and then quickly moved into blues, R&B, southern rock, etc.
What I want to say is this: different genres of music require very different types and feels of playing. And they don't all help each other :lol:
Eg. You are not going to be able to play the rhythm guitar parts on Marvin Gaye's "I Heard Through The Grapevine" with much authority if you've just spent several hours playing fast metal riffery, and vice versa.
It all depends what you're after.
If you want to become a good "session" guitarist that can cover any genre that the gig asks for, or if you want to "break the mould", as it were, then you need to try and master everything - and all of the various suggestions above are helpful. But if you want to play "swinging" rhythms, you'll need to be able to play "loose but tight" - so try to bear that in mind when you're practising more "mechanical" sounding genres, otherwise you'll lose your swing while you're mastering them, and it takes a while to get it back.
It really does depend on what you're after - I'd recommend doing what I do, play along (not note for note, I just try to "join in") with your favourite songs until it sounds like you're "in the band" :D