I want to know the answer to the following question:
Along with Linda Ronstadt, Elton John, Rod Stewart and Elvis Presley, what rock musician sometimes had songs featured on adult contemporary radio?
All the background I'm provided with is that "Also, some of these stations even played softer songs by Elvis Presley, Linda Ronstadt, Elton John, Rod Stewart, Billy Joel, and other rock-based artists.". Is that enough to answer the question?