By Bonnie Stiernberg There’s gotta be some sort of happy medium between “rock is dead” and this. In a recent interview with Swedish radio station P4, as reported by The Independent, Mick Jagger declared Machine Gun Kelly and Yungblud as the future of rock ‘n’ roll. “In rock music you need energy, and there have not been a lot of new rock singers around. Now there are a few,” the Rolling Stones frontman said. “You have Yungblud and Machine Gun Kelly. That kind of post-punk vibe makes me think there is still a bit of life in rock and roll.” While we’ve got to hand it to Jagger for not falling in…