Which artist has been a member of fewer musical groups, Curtis Wright or Paul Di'Anno?
Curtis Wright:  By 1994, he and frequent songwriting partner Robert Ellis Orrall had formed a duo known as Orrall & Wright, which also recorded one major-label album. Curtis Wright:  Wright later succeeded Brent Lamb in 2002 as the lead vocalist for the band Shenandoah, until being replaced by Jimmy Yeary in 2007. Paul Di'Anno: Paul Andrews (born 17 May 1958), better known by his stage name Paul Di'Anno, is a British singer best known as the first vocalist to record with heavy metal band Iron Maiden, from 1978 to 1981.
Paul Di'Anno