took the stage at the Spokane Arena for the first show of his “Get Back” tour on Thursday evening.And a very special guest joined him for a duet on the song “I’ve Got A Feeling.” Footage of Lennon, who died in 1980 at the age of 40, from Jackson’s Disney+ documentary “The Beatles: Get Back” was presented on a big screen while the British rocker sang.The two crooned alongside each other to kick off the new tour.“So, Peter Jackson, the director of the ‘Get Back’ film, he texts me one day. And he says, ‘We can extract John’s voice.