Once in a Lifetime tour will bring four of the prime acts of the seventies together on one stage to make the 2010 tour a truly one-off experience. Once In A Lifetime with The Osmonds, David Essex, Leo Sayer, Les. The Osmonds are an American family music group with a long and varied career. David Essex OBE (born David Albert Cook, 23 July 1947) is an English actor and singer, who have enjoyed a varied show business career. Leo Sayer (born as Gerard Hugh Sayer, 21 May 1948, Shoreham-by-Sea, Sussex) is a British-Australian singer-songwriter and musician whose singing career has spanned four decades. A distinctive singer-songwriter, Sayer was a top singles and album act on both sides of the Atlantic in the 1970s. His first seven hit singles in the UK all reached the Top 10 - a feat first registered by his one-time manager, Adam Faith. Buy Once in a Lifetime Tour Tickets & Sell Once in a Lifetime Tour Tickets through YourTicketMarket.com. One stop tickets market to catch your favouite event tickets like once in a Lifetime Tour Tickets. once in a Lifetime Tour Tickets Guaranteed, Fast and Secure!