The Turtles, aka Mark Volman & Howard Kaylan, have been doing their Happy Together Again Tour for years. It may have been the original oldies tour, with the Turtles and several other 60s era acts. They make a point of having the original lead singers of these bands with them, so the voices you remember from the records are the ones you see on stage. That's the way it's been until this year. For the first time, Howard Kaylan isn't singing lead for The Turtles. Apparently, he's got some health problems, according to his partner Mark Volman. Here's a link to a story with the details:
http://abcnewsradioonline.com/music...aylan-sitting-out-2018-happy-together-to.html
http://abcnewsradioonline.com/music...aylan-sitting-out-2018-happy-together-to.html