Carmello made her Broadway debut in a small role in City of Angels and returned to close the show in the role of "Oolie/Donna". She played "Cordelia, the kosher caterer" in the original Broadway company of Falsettos, and also played Abigail Adams in the revival of 1776. In the Broadway company of The Scarlet Pimpernel she replaced in the role of "Marguerite Saint Just".
Next came "Kate" in the Broadway revival of Kiss Maine, Kate and "Mississippi
Pennywise" in Urinetown. She also appeared as Donna Sheridan in the long-running hit musical, Mamma Mia!.
Carmello originated the role of Alice Beineke in the new musical version of The Addams Family. She took over the role of the Mother Superior from Victoria Clark in the Broadway production of Sister Acting on November 19, 2011.
Carmello can next be seen in the role of Mae Tuck in the Broadway musical adaptation of Tuck Everlasting, set to begin previews on March 31, 2016 before opening April 26 at the Broadhurst Theatre.
The King and I, Paper Mill Playhouse (Millburn, New Jersey)
On The Twentieth Century, Reprise! (Los Angeles)
Bells are Ringing, Reprise! (Los Angeles)
Baby, Paper Mill Playhouse (Millburn, New Jersey)
Saving Aimee, Signature Theatre (Arlington, Virginia)
Little Shop of Horrors, Charles Playhouse (Boston, Master of Arts)
Scandalous, (Pavilion Theatre (Glasgow / United Kingdom)
The Music Manitoba, (Schenectady Theatre)
Grease, (Pittsburgh CLO).