Eesti Raadio Instrumentaalansambel
Estonian Radio Instrumental Ensemble, also known as Eesti Raadio Instrumentaal Ansambel and Инструментальный ансамбль Эстонского Радио под управлением Эмиля Лаансоо was an Estonian ensemble, founded by Emil Laansoo in 1954 and active until 1974.
https://et.wikipedia.org/wiki/Laansoo_ansambel