Two titans of classic rock, Elvis Costello & The Imposters and Daryl Hall, return to Ravinia to co-headline at the Pavilion. Elvis Costello skyrocketed to rock and roll fame in the 1970s and has toured and recorded ever since, forming The Imposters with frequent musical collaborators in the early 2000s and producing hits like “Don’t Look Now” and “Unwanted Number.” Daryl Hall, who joined John Oates to form the chart-topping duo Hall & Oates, has one of the most distinct voices in rock. His vocals on tracks like “She’s Gone,” “I Can’t Go For That (No Can Do),” and “You Make My Dreams (Come True)” have cemented him as one of the great pop hit-makers.