ROCKER Sheryl Crow has worked hard to master her breathing techniques onstage - so she can belch mid-song without offending her audience. Well, my guitar player Doyle (Bramhall II) just thinks its fascinating that I can sing through a burp, if that means anything to you. I can be onstage and, you know, I can sustain a burp until Im done with a phrase, quoted her as saying. You know part of it is just doing it, part of it is singing, its like any other sort of craft of muscle. The more you do it, hopefully, the better you get at it, the more you understand it and the better you are able to control. IANS