I'll never forget one audition i heard for a theatre. The accompanist was quite unprepared and not doing too great a job. She got so exasperated she stopped the audition, told him to leave, and sat down and accompanief herself! An american soprano, really wonderful voice.
It's true what richard black said. But i think the american singers are more prepared then most. I remember working with pavarotti. I swear to you he could not read music. He learned everything by rote. That's why magiera was on a fixed salary in his retinue.