[3][1] Rigacci made her professional opera debut at the Teatro dell'Opera di Roma as Rosina in The Barber of Seville; a role which she is particularly associated with.

Her lyrical Soprano repertoire revolves mostly around the Italian Baroque (Vivaldi, Scarlatti, Cimarosa, Baldassare Galuppi, Pergolesi, Boccherini, Stradella, Gasparini, Sacchini), from whom she has made several recordings with the Solisti Veneti, conducted by Claudio Scimone (Erato) for the Philips and Bongiovanni labels.

She has interpreted Webern, Berg, Schönberg, Berio, Nono, Sciarrino and Casavola, and she has performed some Togni, Pennisi, D'Amico compositions for the first time to an audience.

In February 2011, she participated in the Sanremo Festival as lead vocalist in the song "I Confess" by Mauro Ermanno Giovanardi, along with the artist La Crus, earning accolades from critics and audiences.

She combines her concert activities with teaching master classes at the AEF, Accademia Europea Di Firenze and has also taught at the Scuola Musicale in Fiesole, near Florence, Italy.