Billie Eilish and her older brother Finneas O’Connell may not be rock or country performers, yet they packed Summerfest’s American Family Insurance Amphitheater to capacity. Finneas opened for his younger sister at the Big Gig’s largest venue on Saturday night. The singer-songwriter walked toward a single piano and began matching chord progressions to the ivory on “I’m … Continue reading Billie Eilish, Rhymesayers own night at Summerfest