Background
I recently took over as lead singer of an alt rock band. Around the same time, we lost our guitarist due to a move, and our bassist and keyboardist decided to leave at the same time. We filled these three positions, and it's essentially now a brand new band with the drummer from the old band. All these changes have effectively put me in the de facto leadership position of the band.
My experience in this kind of band is extremely limited, so I don't really know what I'm doing. I don't typically hear of professional bands having a "leader" so to speak, and despite our high ambitions, I want to make sure everyone feels relaxed during our practices. I tried to run our first practice by just basically playing what we felt like, but it felt incredibly disorganized.
I'm okay taking on the role of organizing the band and its practices, but I want to be careful that the band doesn't think I'm viewing it at "MY" band, instead of a collaborative effort.
Question
Is it typical and expected, even in a relaxed band setting, to have one band leader structuring the practices, deciding (with input from the band) what songs the band is going to pick up and practice, and basically keeping everyone on task? How does this change as a band becomes more professional, and what does a typical practice session look like for a rock band?
(To be clear, I'm not asking for opinions on what I should do. I'm interested in finding out what's typical for bands in this genre, so I can use that information to make more informed decisions for my band.)