He gave his first concert as principal conductor of the BPO on 7 September 2002 , leading performances of Thomas AdÃ s ' Asyla and Gustav Mahler 's Symphony No. 5 . He gave his first concert as principal conductor of the BPO on 7 September 2002 , leading performances of Thomas AdÃ s ' Asyla and Mahler 's Symphony No. 5 , performances which received rave reviews from the press worldwide and were recorded for CD and DVD release by EMI .