Benny Andersson and Björn Ulvaeus recruited Lasse Wellander into the ABBA fold very early in the band’s formation. They’d seen him play in both pop and blues-rock situations and knew he’d be great for the job. Not only did Lasse play on most of the singles and albums, he also trekked the world backing the band on the legendary ‘Abbamania’ tours of Australia and Japan, and an equally unforgettable sold-out run of shows at London’s Wembley Arena.