Contemporary Youth Orchestra founder Liza Grossman says she aims to introduce her students to all the potential professions they could have as classical musicians. As a result, she often recruits pop and rock stars to come to town to play with her students. Acts such as Styx, Graham Nash, Pat Benatar, Twenty One Pilots, Jon Anderson, Panic! At the Disco, Fall Out Boy, Coolio, Machine Gun Kelly, Bootsy Collins, Jefferson Starship and Weezer have performed with the group. Tonight's concert that takes place at 7 at Severance Hall features pop singer Kenny Loggins. Tickets start at $31. (Niesel)