Within this organisation Ferrier began working with artists with international reputations; in December 1941 she sang with the Hallé Orchestra in a performance of Messiah together with Isobel Baillie, the distinguished soprano.
Dentro desta organización Ferrier comezou a traballar con artistas de reputación internacional; en decembro de 1941 cantou coa Hallé Orchestra nunha interpretación do Messiah xunto con Isobel Baillie, a distinguida soprano.