how does a band stay together with different passports?

[kringekidtaco]

in my band that we've started, there are three of us.
i have a british passport, one has indonesian and other singaporrean.

we started the band in singapore because we all go to school there, but when we eventually finish schooling we'll most likely have to move back to our countries.

is there any possible way for us to stay together so we can continue this career?

please no comments on "you're aiming too high" or "just do something else" because i really want to be able to perform and play music.

thanks all