Deep Purple singer-musician Glenn Hughes said Tuesday he is retiring from touring as he prepares to undergo heart surgery. 'The results from numerous MRIs, CT scans, and an echocardiogram have alerted my medical team, that I need another open-heart surgery,' Hughes said. Deep Purple singer-musician Glenn Hughes, 74, said Tuesday he is retiring from touring as he prepares to undergo heart surgery. He gained prominence with the group Trapeze in the 1970s before his 1973 addition to Deep Purple, which also featured David Coverdale joining the band. Hughes and his colleagues in Deep Purple had been inducted into the Rock & Roll Hall of Fame in 2016.