Remember that these generally are not professional or studio recordings, thus there are a great variety of acoustic properties (aka noise). You are not listening to enjoy the sound, but to learn from Lehmann’s teaching, which still comes across, even in compromised sound.
The following track is Lehmann greeting her Northwestern University students and audience in 1967.
Here are some of the moments when Lehmann offered advice to her students, or summed up her teaching philosophy.
From a Pasadena master class, here are Lehmann’s “Final Remarks.” She offers advice (and a demonstration) on the use of the hands, talks about the eyes of a singer, etc. Also, she talks about the future of fine are and warns against easy success.
From a MAW final master class series, here’s another Lehmann goodbye and philosophy.
In a master class Lehmann addresses the eternal question of whether a woman should sing a man’s song.
In 1988 WQXR in New York presented a Lehmann Centennial program. The guests included former student, Luba Tcheresky; colleague, Risë Stevens; conductor-pianist, Ignace Strassfogel; and vocal expert, librarian, and recorded sound historian, Philip Miller. I’ve removed the Lehmann recordings and done some other editing, to make it of reasonable length.