Having never recorded an album -- but I'm still waiting, Motown, if you want to give me the chance -- I believe intense concentration would be necessary and normal, as the artist would want to get every word, every note, every phrase and every nuance perfect when working in the studio. A minor flaw in a concert might not be a major concern, as performances are impermanent, but perfection is absolutely essential when making a record, as those sounds are preserved forever, whether to be savored or to stab one in the back. Too, every minute counts, studio time being as expensive as it is. I cannot fault Ms. Ross for demanding uninterrupted moments, as her standards are high, and second-best results would not suit her well in the long run. Why decimate one's career just to please some nobody? And I don't necessarily believe the words of a disgruntled delivery boy who perhaps expected much too much when he chose to ignore the "don't disturb" sign on the door.