Her worldwide album sales may have topped the 50 million mark, but home for singer Linda Ronstadt is anything but flashy. During the school year, she and her two children reside in a four-bedroom, two-bathroom Craftsman-style San Francisco duplex she bought a couple years ago for its "good light, good architecture and nice view of the bay." The multi-Grammy-winner -- who comes to the Rosemont Theatre March 25 for a special performance with the Chicagoland Pops Orchestra -- says she gravitates toward anything that's from the past -- specifically, before 1906. She has furnished her home with "a funny mixture...