Thebom made her European debut in 1950 as Dalila at the Royal Swedish Opera (RSO). She returned to the RSO several times, singing such roles as Amneris, Eboli and — in what The Times described as "a not especially successful attempt at a soprano role" — as Elisabeth in Tannhäuser.
Thebom made her European debut in 1950 as Dalila at the Royal Swedish Opera (RSO). She returned to the RSO several times, singing roles such as Amneris, Eboli and — in what The Times described as "a not especially successful attempt" — as Elisabeth in Tannhäuser.