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Oscar Peterson heard some of their work and recommended them to the MPS label. In 1971 his trio with bassist George Mraz (who at the time was known as Jiri Mraz) and drummer Louis Hayes recorded with the Singers Unlimited, or at least laid down tracks for the vocalists to overdub over. Most of the selections on In Tune are ballads with spots for Peterson to solo, although the voices naturally dominate. -AllMusic