There’s no question that k.d. lang possesses one of the most powerful voices in pop. See her and The Siss Boom Bang at The Grand Opera House in Wilmington on June 5 as they perform 20 years of genre-bending tunes, from the country and rock of her early career to peerless pop to the classics that have won her several Grammy Awards. Tony Bennett has said, “She’s the best singer of her generation.” (652-5577, thegrandwilmington.org)