Mama Lilly, Hank Williams: Lost Highway, Gretna Theatre:
"...Williams’ Mama Lilly (Heidi Hayes), who is a lovable bit of comedic relief in a story heavy with substance abuse and the rigors of success."
Pianist, Side By Side By Sondheim, Walnut St. Theatre:
“The show is a collection of some of his best-and least-know songs, sung by four good voices, accompanied by two good pianists....But the show ends with a very funny medley – even the piano players sing – and you'll exit humming, guaranteed.
-Toby Zinman, Philadelphia Inquirer
Pops Concert, Ocean City (NJ) Pops:
Heidi Hayes manages to wring every nuance from a lyric. Her gestures and facial expressions speak volumes...Later, she broke many a heart in excerpts from Camelot...
Hayes is versatile and makes the jump from grand opera to saloon singer with an aplomb rarely achieved by operatic sopranos.
-Ed Wismer, Ocean City Sentinel-Ledger
Susannah, Tulsa Opera:
….Hayes....effectively captured the role(s) of....tongue-wagging wive(s).
-Ellis Widner, Tulsa Tribune
Ballad of Baby Doe, Central City (CO) Opera:
The rest of the cast, particularly....Heidi Hayes....as August Tabor's friend(s), were energetic actor(s) and actress(es) and sang extremely well.
-Blair Chotzinoff, KVOD
St. Matthew Passion, Philadelphia Singers:
Local singers included Soprano Heidi Hayes, who sang not only her own solos but also those of the indisposed Doralene Davis...” Hayes...sang her arias with a bright well-projected tone and a fine sense of involvement with the text. She was especially good in the fast passages of Lord, to Thee my Heart is Given.
-Michael Caruso, Main Line Times
Hansel and Gretel, Hollybush Opera Theatre (NJ):
In the Dew Fairy's brief solo, Heidi Hayes sings softly and appealingly.
-Robert Baxter, Courier-Post
Magic Flute, Pennsylvania Opera Theatre:
...the three genii, like goofy street urchins, sang their beguiling music in fine ensemble, preserving individual character in unshakeable togetherness.
-Daniel Webster, Philadelphia Inquirer