This is from Dierdre Murray, musical adaptor of the upcoming Diane Paulus "Porgy and Bess". I got the quote from another site.
"At the beginning of the show, Clara is singing 'Summertime' to her baby. But when I listened to it, I asked myself, 'Why is she singing so high? That would wake the baby up. It has to be a lullaby.' So I took the whole thing down. And then I decided that I wanted to use an accordion, because whenever I hear an accordion it always transports me someplace else—a folkloric place that doesn't have machines. So the show now opens with Clara singing 'Summertime' as a duet with the accordion."
To me there is no more thrilling opening to a show - musical or opera - than Porgy and Bess's harsh honky tonk piano music suddenly dissolving into the langorous beauty of Clara's high floating soprano singing to her baby on a hot summer night. Why on earth would they mess with one of the great moments of the piece and add an accordian!!!
Faced with these Loreleis, what man can moralize!