Rick Pender, author of The Stephen Sondheim Encyclopedia and former editor of The Sondheim Review suggests:

"Check out the recent Sounds of Broadway podcast, “Styles of Stephen Sondheim,” presented by Gail Leondar-Wright, an accomplished and serious amateur scholar of Sondheim’s works. She offers insightful comments about a half-dozen Sondheim shows with musical samples that underscore her observations."

Sounds of Broadway podcast