▁been ▁released , ▁and ▁work ▁is ▁on ▁going ▁on ▁pieces ▁by ▁Hay dn , ▁Sch ub ert , ▁M end els so hn , ▁as ▁well ▁as ▁a ▁selection ▁of ▁ 2 0 th - century ▁music . ▁Re per toire ▁ ▁Bern hard ▁Sie ber er ▁has ▁a ▁broad ▁re per toire : ▁it ▁includes ▁ch oral ▁works ▁from ▁the ▁Renaissance ▁up ▁until ▁the ▁ 2 1 st ▁century ▁and ▁orch est ral ▁pieces ▁by ▁a ▁variety ▁of ▁compos ers , ▁r anging ▁from ▁Bach ▁to ▁Bru ck ner , ▁from ▁Moz art ▁to ▁Mah ler , ▁from ▁Be eth oven ▁to ▁Brit ten , ▁and ▁from ▁Pur cell ▁to ▁Pir ch ner . ▁A ▁main ▁focus ▁has ▁been ▁orch est ral ▁cho ir ▁music ▁by ▁Monte ver di ▁and ▁Sch üt z . ▁Sie ber er ▁regularly ▁conduct s ▁works ▁by ▁Hand el , ▁Bach , ▁Hay dn , ▁M end els so hn ▁and ▁Bra h ms , ▁as ▁well ▁as ▁Bru ck ner , ▁Or ff ▁and ▁Hon eg ger , ▁and ▁also ▁contemporary ▁music . ▁ ▁Selected ▁works ▁ ▁Werner ▁Pir ch ner ▁– ▁strings ▁( Cap ella ▁Ist ropol it ana , ▁Lit au isches ▁Kam mer or chester , ▁Camer ata ▁St . ▁Petersburg ), ▁OR F ▁ 2 0 0 2 ▁ ▁Wolfgang ▁Ama de us ▁Moz art ▁– ▁F ag ott kon z ert , ▁O bo enk on z ert , ▁K lar inet ten kon z ert ▁( Rich ard ▁Gall er