Conductor Daniel Barenboim will miss the opening of the Chicago Symphony Orchestra’s new season after doctors advised him not to travel from his home in Berlin. Barenboim is being treated for several herniated discs in his back. Sir Andrew Davis, of the Chicago Lyric Opera, will lead the CSO this weekend in Barenboim’s stead. So far, the orchestra expects Barenboim to return for his scheduled concerts later in the month, but isn’t making any guarantees.