Call it the musical appreciation society of mature age Rich Listers.

On Monday, retail and burger king Jack Cowin (No. 25 on this year’s list with $2.79 billion) and Harvey Norman co-founder and executive chairman Gerry Harvey (No. 40 with $1.9 billion) joined their close friend, former ad man and entrepreneur John Singleton (on 145th spot with a paltry $670 million) at his Saddles restaurant in Mt White, on Sydney’s outskirts for an intimate concert with 83-year-old rocker Kris Kristofferson, who played opposite Barbra Streisand in the 1976 version of A Star is Born.