Two women on a stage in purple light

Erin Markey and April Matthis in a scene from "Most Happy in Concert" at the Williamstown Theatre Festival. 

WILLIAMSTOWN — Okay. First things first.

There is a great deal of onstage talent in director Daniel Fish’s “Most Happy in Concert ‘’ at Williamstown Theatre Festival’s Main Stage.

In terms of vocal range and styles, Fish’s seven-member cast — Tina Fabrique, Maya Lagerstam, Erin Markey, April Matthis, Mallory Portnoy, Mary Testa, and Kiena Williams — cover the gamut from pure crystalline soprano to smooth blues to deep, smoky torch.

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Jeffrey Borak is The Eagle’s theater critic.