Gladys Swarthout was a participant in many radio shows and broadcasts during her lifetime. The earliest I have documentation on is in 1934 and the latest was February 22, 1954.

La Ci Darem (Don Giovanni) w/ Frank Chapman c.1934

In Questo Sudo (La Favorita) w/ Frank Chapmen c.1934

Will You Remember (Romberg) w/ Chapman c.1934

Dome Epais (Lakme-Delibes) w/ Helen Jepson c.1935

Voce Di Donna (La Gioconda-Ponchielli) c.1936

Che Faro Senza (Orfeo & Euridice-Gluck) c.1936

Una Voce Poco Fa (Barber Of Seville-Rossini) c.1937

Lescia Ch'io Piango (Rinaldo-Handel) c.1937

The Main I Love (Gershwin) Gershwin Memorial. September 08,1937

Ah Mon Fils (Le Prophete-Meyerbeer) c.1942

Non So Piu Cosa S On (Nozze Di Figaro-Mozart) c.1943

Voi Che Sapete (Nozze Di Figaro-Mozart) c.1943

My Tender Playmate - Pique Dame-Tchaikowsky c.1944

Il Est Doux, Il Est Bon (Herodiade-Massenet) c.1944

Songs Of India (Sadko-Rimsky Korsakov) c.1944

Land Of Hope And Glory (Elgar) c.1944

Io Sono L'umile Ancella (Cilea) Concert Hall 1944

Adieu Forets(Jeanne D'arc) c.1945

Letter Scene (Werther-Massenet) Bell Telephone Hr. October 20, 1947

Granada (Lara) Intro By Lionel Barrymore Concert Hall. 1943

Through The Years…With Dialogue Guest Star 1949

Je T'adore (La Perichole-Offenbach) Met Concert. 1950

The Railroad Hour - "Martha" February 22, 1954