“Yet some of the finest singing of the night came in the smallest assignments, from performers given just one aria apiece. As the nymph Clori, Robin Bier used her robust, shapely contralto to give a lavish account of her showpiece.”  (Handel Parnasso in Festa, American Bach Soloists Academy)
San Francisco Chronicle

“Contralto Robin Bier’s mysterious dark hue and sauntering presence stood out in particular.”
San Francisco Classical Voice

Among the vocal selections, one of the most compelling was the account of the “Agnus Dei” aria by contralto Robin Bier. Bach specified this aria for alto, and there is a good chance that Bach never composed with a contralto in mind…Nevertheless, many contraltos have taken the “Agnus Dei” aria to heart, the most notable of them being Kathleen Ferrier, whose rich warm sonorities were entirely consistent with the hypothesis that BWV 232 was never intended for sacred purposes. Bier’s performance of “Agnus Dei” had all of the promising signs of a “Ferrier in waiting.” (Bach Mass in B Minor, American Bach Soloists Academy)
The Rehearsal Studio

“The Agnus Dei was exquisitely sung by contralto Robin Bier” (Bach Mass in B Minor, American Bach Soloists Academy)
Berkeley Daily Planet 

“Bier provided an interpretation of the text that was compellingly devout, while, at the same time, displaying again the full warmth of her command of the lower register.” (Bach Cantata 45, American Bach Soloists Academy)
The Rehearsal Studio

“Bier’s particularly moving singing of the “Agnus Dei” was matched by violinist Robert Mealy and expressive organ continuo by Webb Wiggins.” (Bach Mass in B Minor, Oberlin Baroque Performance Institute)
Cleveland Classical

“… the essential alto aria Es ist vollbracht, sung by Robin Bier, has considerable emotional resonance.” (St. John Passion, Yorkshire Baroque Soloists, Signum Classics)
Fanfare Magazine

“[Es ist vollbracht] is entrusted to Robin Bier and she makes a very good job of it, singing expressively but without any overemphasis or excess of emotion.” (St. John Passion, Yorkshire Baroque Soloists, Signum Classics)
MusicWeb International