Founded in 1997, Trio Mediaeval developed its unique repertory during intense periods of work at the Hilliard Summer Festivals in England and Germany between 1998 and 2000, and subsequently with Linda Hirst and John Potter. "Singing doesn't get more unnervingly beautiful," wrote Joshua Kosman of the San Francisco Chronicle, who declared their San Francisco debut "among the musical highlights of the year." He added, "To hear the group's note-perfect counterpoint is to be astonished at what the human voice is capable of."
“These three women have astonishingly beautiful voices,” Robert Levine wrote in American journal Stereophile, “with individual timbres that nonetheless mingle seamlessly... Trio Mediaeval sings with feeling, depth, and — dare I say it? — soul”. Such sentiments were echoed also throughout Europe. "A most impressive new group,” said Britain’s Early Music Review: “Their clear and unforced voices, with superb control of intonation and blend of tone, combine with an obvious musical intelligence, as evidenced by their ability to shape a musical line and give structure to a piece. Others have tried to reinterpret the medieval repertoire for soprano voices, but none as successfully as this young group."