鈥楽ide by Side鈥 is more than just a musical review BOULDER, Colo. 鈥 Imagine hanging out with legendary composer and lyricist Stephen Sondheim and a few of his closest friends鈥擝ernadette Peters, Leonard Bernstein, Mandy Patinkin and others鈥攁s they chat and swing into some of his greatest works. That鈥檚 what you鈥檒l experience onstage when CU Opera performs 鈥淪ide by Side by Sondheim鈥 April 24-27.