The Swedish tenor Jussi Björling (1911-1960) began his distinguished career as a boy soprano in 1915 at the age of four-and-a-half, singing in a trio with his brothers Olle (1909-1965) & Gösta (1912-1957), who were all trained by their father David (1873-1926), an opera & concert singer. During an American recital tour 1919-21 they performed either as "The Björling Male Quartet" or as a "Juvenile trio" & about 6/9 Feb. 1920 the three boys were recorded in New York by Columbia in six items on 78 rpm discs, mostly singing in unison.
The photo at left shows David and his four sons. Back row: Gösta, David, Jussi. Front row: Karl and Olle.
Jussi Björling "Juvenile Trio" (Olle, Jussi & Gösta Björling) with reed-organ accompaniment. On this record there are solo passages and it sounds as though the two older boys both take solos. It is tempting to hear the forceful leading singer as being the nine-year-old Jussi, but it could be Olle (then nearly eleven). (This item is available on CD: Bluebell ABCD016  & Gala 315.)