4:45 Erna Sack sings Frühlingsstimmen (Voice of Spring) by Johann Strauss 5:38 Glass Shatterers! Erna Sack - J. Strauss II: Voices of Spring, 1937 Live, High F6, G6, B6 2:12 Erna Sack - Voices of Spring 4:48 Erna Sack - Voix du printemps 4:46 The Amazing Erna Sack! Voices of Spring ! Johann Strauss Beautiful Sound HD Titonut 2018 2:03 (LIVE) Erna Sack - Voices of Spring Waltz (Frühlingsstimmen) • B6 staccato and high F#6 8:39 Opera Series - Erna Sack in Nanon (1938) - Film Vocal Range (A3-C7) 2:52 Glass Shatterers! Erna Sack sits on two High Fs in a lively song 5:23 Ingeborg Hallstein sings Frühlingsstimmen Walzer (Voices of Spring Waltz) by Johann Strauss II 4:00 (RARE) Erna Sack - Una Voce Poco Fa (in German) with High Bb6 & G#6 - 1936 8:24 Erna Sack \"Die Deutsche Nachtigall\" Folge 2 4:38 Martha Eggerth,Voices of Spring 9:12 Erna Sack sings Kaiserwalzer(Emperor Waltz) 4:43 VOICES OF SPRING by Erna Sack 1:28 Erna Sack - Nanon 4:12 Erna Sack sings Draußen in Sievering by Johann Strauss. 3:24 Erna Sack sings \"Ay, Ay, Ay\", Serenade by Perez Freire