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Vidnovic made his Broadway debut in the ill-fated Home Sweet Homer (1976) which, following a one-year tour, closed on opening night.  He fared better with his next three projects, revivals of The King and I (1977), Oklahoma! (1979), and Brigadoon (1980). Vidnovic's performance in Baby (1983) won him the Drama Desk Award for Outstanding Featured Actor in a Musical. Additional Broadway credits include Guys and Dolls (1992), A Grand Night for Singing (1993), and King David (1997).
He was cast in the 1998 stage adaptation of Footloose but was replaced during previews.
Off-Broadway, Vidnovic was cast as El Gallo late in the run of the original production of The Fantasticks and appeared in the 2006 revival as Bellomy. Additional off-Broadway credits include Lies and Legends: The Musical Stories of Harry Chapin (1985), Olympus on My Mind (1986), and the 2003 Jerry Herman revue Showtune.
Vidnovic is also the uncle of former Minor Threat bassist Steve Hansgen.
- 1981 Tony Award for Best Actor in a Musical (Brigadoon)
- 1981 Drama Desk Award for Outstanding Actor in a Musical (Brigadoon)
- 1980 Drama Desk Award for Outstanding Featured Actor in a Musical (Oklahoma!)
- Lovendusky, Eugene. "Martin Vidnovic: What Matters to Him" broadwayworld.com, July 15, 2007
- "'Home Sweet Homer' LIsting" ibdb.com, accessed March 29, 2016
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- "'Brigadoon Broadway" Playbill (vault), accessed March 29, 2016
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- "'The Fantasticks' Listing" lotel.org, accessed March 29, 2016
- Gans, Andrew. "Burmester, Dixon and Vidnovic to Star in Fantasticks Revival" Playbill, June 28, 2006
- "'Olympus on My Mind' Listing" lortel.org, accessed March 29, 2016
- Finkle, David. "Review" theatermania.com, February 28, 2003
- McGee, Celia. "Sing Out, Laura. It’s Your Turn." The New York Times, March 23, 2008
- Sokol, Robert. "Cabaret singer Laura Benanti has Broadway in her blood" sfexaminer.com, May 8, 012
- Lefkowitz, David. "PLAYBILL ON-LINE'S BRIEF ENCOUNTER with Laura Benanti" Playbill, May 11, 1999