I have a question for Greta Gerwig, the odd naturalistic beauty who has bounded out of the Mumblecore underworld into the bright and glaring lights of mainstream attention, while still skipping back and forth across the great divide.   

The low-fi craze mumblecore, with its casual, hip camera techniques and sometimes barely audible improvised dialogue, has dominated Sundance, SXSW and other U.S. indie film festivals for the last few years. 'Cyrus' seeks to expand on that success, thanks to filmmaker brothers Jay and Mark Duplass and the summer's most unlikely hero, Jonah Hill. Grade: B.