JONATHAN EDWARDS How Mr. “Sunshine” found an audience without the help of the music business “Sunshine,” the Top 5 hit from Jonathan Edwards’ self-titled 1971 debut album, announced his arrival with a bang. But the Minnesota-born singer and songwriter proved unable to follow that now-classic tune with another big pop hit—a quandary that he ascribes in part to troubles with his management. “Suddenly I had some street cred and respect...