Anyway I don't feel like calling up each of the band members individually to tell them I'm leaving, but a text message seems pretty impersonal. What do you think?
IMO, it depends... that's a judgment call you'll have to make. FWIW I essentially quit a band via text a couple years ago. I'd played with two of those guys for over a decade, but there had gotten to be lots of band drama, a loss of gigs in part because of that drama, and the singer was constantly frustrated because I'd picked up much of the slack with other bands, so it was hard for him to book gigs around my busy schedule. On top of that I was annoyed that we'd been renting a rehearsal room (long story) -- we didn't use it much, and no longer had the gigs to cover that expense.
That band mostly communicated via text, so I texted them that I was sorry, but no longer willing to pay for the rehearsal room, and given my lack of availability it would be better for them to find another bassist regardless. Of course I added that we'd had a great run, I'd really enjoyed it, etc etc.
Because of all the aforementioned drama and frustration, my announcement was not a surprise and no one was offended that it came via text. If circumstances were different -- say I had quit while we were at our peak, because I got a much better offer or whatever -- I'm sure I would have called them all individually.
Again, it's a judgment call. Seems like you all have been a "family" kind of band, so perhaps it's better to call... maybe call the BL, and text everyone else? (shrug) The alternative to a "family" band would be a pro band -- what I mean is, one where all members are semi or full pro, and no one needs to justify leaving for greener pastures (assuming enough notice is given to find a sub to cover upcoming gigs, but with pro bands that's usually not a problem).
