 Shane's Kingston Trio relied heavily on a "greatest hits formula" augmented by a number of other songs acquired through the years that fans had accepted as part of the group's repertoire.In March 2004, a month after his 70th birthday, Shane suffered a debilitating heart attack that forced him into retirement from touring and performing after 47 years with the act.Though Shane had initially planned to return to the group after convalescing, the attack was severe enough to warrant Shane's permanent withdrawal from performing with the group that he still owns.