Jackson, according to a press release, will not perform in the musical at the Helen Hayes Theatre July 17-27 due to a prior commitment. During his absence the role of Sonny will be covered by actors Curtis Holbrook and Andre Ward, alternately.

Jackson is scheduled to return to Xanadu July 28.

Cheyenne Jackson, who was seen in the film "United 93," has appeared on Broadway in All Shook Up, Aida and Thoroughly Modern Millie. He starred in the premiere cast of Altar Boyz, and his regional credits include West Side Story, The Most Happy Fella, Children of Eden, Hair, Carousel, Damn Yankees and Kismet. Jackson is a member of the Broadway Inspirational Voices and was recently seen Off-Broadway in The Agony and the Agony.

Xanadu boasts a book by Little Dog Laughed playwright Douglas Carter Beane — a 2007 Tony Award nominee — and utilizes songs from John Farrar and Jeff Lynne's film soundtrack. The musical, according to press notes, "tells the story of one of the nine muses of ancient Greece who comes to earth to inspire the greatest of artistic achievements – a roller disco. Along the way she falls in love, bumps into an old acquaintance and for the first time, feels the desire to create herself."

The performance schedule is Tuesday-Saturday at 8 PM, Saturday at 2 PM and Sunday at 3 PM.

The Helen Hayes Theatre is located in Manhattan at 240 West 44th Street.