i drink beer and ride all the time, not on rollers but on the street. the trick is to drink enough out of the can so that you can squeeze it in the middle so that it's skinnier and hold it between your pointing and index fingers and rest the remainder of your hand on the bars. You need to live in a place like Oakland though, i know i'm not used to living in city where cops have nothing to do. I sing too, last night i sang "my love is like a hurricane" in the rain while riding to the bar, chorus only because i don't know all the words. I think classic rock songs work real well.