The San Antonio Philharmonic has pushed back its Classics III concert series, originally scheduled for Oct. 18-19, until next spring, Executive Director Roberto Treviño confirmed Wednesday. The postponement of the concerts — which are to feature piano soloist Jon Kimura Parker performing George Gershwin’s Piano Concerto in F — comes after two key Philharmonic donors sued the orchestra earlier this month to force repayment of what court documents called $180,000 in loans. The legal dispute arose following the exodus of at least a dozen Philharmonic employees, including Chief Financial Officer Sylvia Romo, in recent weeks, according to the San Antonio Report.