Eden Prairie teen plays onstage with Jack Johnson at Mystic Lake

Eden Prairie teen plays onstage with Jack Johnson at Mystic Lake

CJ Rodriguez, a soon-to-be Eden Prairie High School junior, grew up listening to Jack Johnson, one of Hawaii’s best-known singer-songwriters. Rodriguez knows Johnson’s songs, Johnson’s lyrics, and, this is the big one, Johnson’s guitar chords. On July 12, Johnson performed for a sold-out crowd at the new Mystic Lake Amphitheater in Shakopee. Rodriguez had tickets and a plan. “I saw a video last week of Jack inviting a kid up on stage to play a s…