The long-running musical will celebrate the fourth anniversary of its first Broadway preview on Oct. 5, and Oct. 18 will mark the fourth anniversary of its Broadway premiere. The musical — featuring music and lyrics by Benny Andersson and Björn Ulvaeus, a book by Catherine Johnson, direction by Phyllida Lloyd and choreography by Anthony Van Laast — originally opened at the Winter Garden Theatre Oct. 18, 2001.

The Broadway company will also welcome a host of new stars on Oct. 19. Husband-and-wife actors John Dossett and Michele Pawk will join the cast as, respectively, Sam Carmichael and Donna Sheridan. Olga Merediz, seen on Broadway in Reckless, Man of La Mancha and Les Misérables, will become the newest Rosie; Carey Anderson, seen in the national tour of Mamma Mia!, will step into the role of Sophie Sheridan; and Andy Kelso will become the new Sky.

The hit musical will also once again support Breast Cancer Awareness month with the sale of the "Rock Chick Supremo" white and pink T-shirt, which was designed by Mamma Mia! producer Judy Craymer. Over 200,000 T shirts have been sold in North America alone since they first went on sale in Oct. 2002. To buy a shirt visit www.mamma-mia.com.

Mamma Mia! employs the hit songs of famed pop group ABBA to tell the story of Sophie Sheridan, a young girl who hopes to discover the identity of her father. On the eve of her wedding, she brings three men from her mother Donna's past back to the Greek island they visited over two decades ago.

The musical plays the Winter Garden Theatre, which is located in New York City at 1634 Broadway. For tickets, call (212) 239-6262. Mamma Mia! offers performances Wednesday through Saturdays at 8 PM, Wednesdays and Saturdays at 2 PM and Sundays at 2 and 7 PM.