▁a ▁Czech - A ust rian ▁oper atic ▁sop rano . ▁ ▁Life ▁and ▁career ▁Müller ▁was ▁born ▁in ▁T ere z ín , ▁Boh emia ▁ion ▁ 2 9 ▁January ▁ 1 8 9 8 . ▁ ▁She ▁studied ▁in ▁Vienna ▁with ▁Erik ▁Sch med es , ▁and ▁deb uted ▁in ▁Lin z ▁in ▁ 1 9 1 9 ▁as ▁El sa ▁in ▁L ohen gr in . ▁She ▁also ▁sang ▁at ▁the ▁Deutsch es ▁Theater ▁in ▁Prag ue ▁in ▁ 1 9 2 1 - 1 9 2 3 ▁( where ▁she ▁sang ▁the ▁role ▁of ▁N ett chen ▁in ▁the ▁premi ere ▁of ▁the ▁re vised ▁version ▁of ▁Alexander ▁Z em lin sky ' s ▁opera ▁Kle ider ▁mach en ▁Le ute ) ▁and ▁at ▁the ▁Staats oper , ▁Mun ich ▁in ▁▁ 1 9 2 3 - 1 9 2 4 . ▁ ▁On ▁ 2 1 ▁January ▁ 1 9 2 5 , ▁she ▁made ▁her ▁debut ▁at ▁the ▁Metropolitan ▁Opera ▁as ▁Sieg lin de ▁in ▁Die ▁Walk ü re . ▁The ▁next ▁day , ▁O lin ▁Down es ▁wrote ▁in ▁The ▁New ▁York ▁Times : ▁“ you ng ▁Czech ▁sop rano ... was ▁warm ly ▁wel com ed . ▁She ▁has ▁a ▁fresh ▁and ▁youth ful ▁voice , ▁a ▁little ▁small ▁for ▁the ▁dem ands ▁of ▁her ▁role , ▁much ▁grace ▁and ▁sin cer ity ▁as ▁an ▁actress . ▁Not ▁often ▁is ▁the ▁figure ▁of ▁Sieg lin de ▁so ▁human , ▁so ▁tender ▁and ▁so ▁appe aling