In school I was in a rock band and I always miss playing music
Four people in a band is pretty common, but how many people were in your band?
We had four.  The standard set up of one drummer one bass player.  Lead guitarist and keyboardist
Did you have a vocalist? Sometimes vocalists don't play an instrument but it's interesting when they're able to multitask.
Band (rock and pop)
What did you play in your band?
Our guitarist and keyboard player shared vocals. 
So you must have played the drums or bass?
I was the drum player.  I really annoyed my parents when I practiced in the house!
Did you use a full drum set with cymbals and bass drum? I bet they wish they could have put you in a sound proof room!