Roles that I would go back to musical theatre for:

• The Baroness in the Sound of Music (if you've only seen the movie, you won't understand, but How Can Love Survive is one of my favorite songs in the R&H empire)
• Rosalie in Carnival (though Lily's song Mira is one of the few soprano songs I can still sing)
• Audrey in Little Shop of Horrors (actually, anything in Little Shop of Horrors)
• The Leading Player in Pippin
• Nellie in South Pacific (I don't have any of those notes any more, but it's still my favorite)
• Jenny in Threepenny Opera
  
• whoever sings Frank Mills in Hair