Providing it's not after 11pm and it's not incredibley loud (IE drums) then I doubt most neighbours would mind too much? Perhaps ask them if there are any times when they'd rather not hear noise through the walls.
We have full band practice with amped guitars, bass and drums in our drummers flat a few nights a week, we just don't play after 11, or 10 on Sundays. Admittedly, it is in Stoke's Croft, so I guess it depends on the attitude of the locals...