Jimmy Buffett is playing live again for the first time since he was hospitalized last May.  The “Margaritaville” singer made a surprise appearance at a concert in Rhode Island on Sunday that featured members of his Coral Reefer Band, and told his cheering fans that it’s “good to see an audience.”  Buffett had to cancel a concert in May after he was hospitalized for an unspecified medical issue.  On Sunday he played for about 45 minutes at a venue whose owner said it was clear Buffett was “itching to get back on the road.”