[7][8] Errico took a leave of absence from Yale and performed in a tour of Les Misérables, then returned to complete a degree in art history and philosophy.
The production ran at the Eisenhower Theater at the Kennedy Center in Washington, D.C. from May 31 to June 28, and Errico's work was recognized with a Helen Hayes Award nomination for Leading Actress in a Musical.
[16] In 2003 Errico also returned to the role of Eliza Doolittle, alongside John Lithgow and Roger Daltrey, for a production of My Fair Lady at the Hollywood Bowl in Los Angeles;[17] she also starred there in Camelot opposite Jeremy Irons[18] and The Sound of Music with Marni Nixon as Mother Abbess.
[21] In 2013 she co-starred as Clara in the Classic Stage Company production of Stephen Sondheim's Passion, earning a Drama Desk Award nomination for her performance.
[23] She has also starred in several productions for Irish Repertory Theatre including the musical Finian's Rainbow and her Drama Desk Award-nominated performances in the plays The Importance of Being Earnest[24] and Candida.
[28] In 2022, The Wall Street Journal said her new album Out Of The Dark: The Film Noir Project "gives us noir music the way we imagine it...melancholy, bittersweet tales of isolation and loneliness, beauty and betrayal—especially relevant at the height of the Covid-19 pandemic...Ms. Errico sings throughout with a tone at once wistful and probing, suggesting that romance and mystery are but different sides of the same coin...we are breathing along with her, seeing what she sees, feeling what she feels...she makes it "uncommonly clear" that we are all silent partners in our own destruction, and that the most we can hope for is a few brief moments of tenderness".
[32] Errico has also appeared on The Jim Gaffigan Show,[33] Blue Bloods,[34] The Good Wife,[34] Law & Order,[35] A Gifted Man,[36] Ed,[35] and Miss Match opposite Alicia Silverstone.
[38] In 2019, Errico curated a film festival for French Institute Alliance Française (FIAF) in New York City celebrating movies featuring the music of composer Michel Legrand.
[39] In 2021 at the height of the pandemic, The New Yorker writer Adam Gopnik and Melissa Errico curated FIAF's new CinéSalon series Out of the Dark: The Mystery of Film Noir.
[41] Errico's recording of a song from David Shire's new musical Table was aired in April 2015 on NPR radio on The Jonathan Schwartz show for WYNC.
[57] On March 22, 2020, to celebrate his 90th birthday, Guild Hall of East Hampton premiered her Stephen Sondheim concert on YouTube with an exclusive livestream.
[59] In June 2023 Errico opened for George Benson at the Montreal International Jazz Festival at the Salle Wilfrid-Pelletier before a sold-out crowd of 3,000 people, singing a set of music by her mentor the late Michel Legrand.
Montreal audiences always want to show their warmth and this one made her deservedly welcome.”[60] Added the Quebec Journal, in its review, "It was the Italian-American chanteuse Melissa Errico who was responsible for energizing the concert hall, and that she did, expressing herself as fluently in French as in English, and offering a memorable reprise of Legrand's "Valse des Lilas/Once Upon A Summertime.
[85] Errico appeared in Take Me to the World: A Sondheim 90th Birthday Celebration, a fundraiser for Artists Striving To End Poverty (ASTEP) in April 2020.