At the age of seven, she began singing in her hometown church choir "Voci Bianche"[2] (White Voices), which she was part of until her teenage days.

She found inspiration in soul legends such as Mary J. Blige, Stevie Wonder, Brandy Norwood, and her greatest idol, Italian R&B diva Giorgia.

In 2004 her best friend filled out an application form for her, to audition for the second season of Music Star, the Swiss version of American Idol.

[6] For the[7] Subex gala in Egypt, Claudia was invited to Al-Qusayr and only a few weeks later she was the main act for the Swiss stage at the[8]Olympic Winter Games 2006 in Torino (Italy).

In 2006, renowned German songwriter and composer Ralph Siegel asked her to be part of his[9]2006 Eurovision Song Contest project.

In 2008, Zurich's Christopher Street Day Committee asked Claudia's songwriter Jiameé if he was interested in writing something for the event.

[14] The Song was performed by all tree artist on the 2008 Christopher Street Day Zurich concert stage as opening act for Ultra Naté, Colton Ford and Ari Gold feat.

", David Guetta’s main voice Chris Willis, singer & DJ-ane Billie Ray Martin and Italian Superstar Tommy Vee.

As a surprise during her set, New York power-voice-diva "Kelly King" entered the stage singing the first notes of Gloria Gaynor's "I will survive" turning into a duet of "Pink Riot!

", that was Tanja La Croix’s, Claudia D'Addio’s and Donna Tella’s, official Christopher Street Day Hymn 2008.

MC Wreckid, Swiss-ex-porn-star Paula Styles & K-Skill, New York’s 7 octaves wonder "Kelly King", “Deutschland sucht den Superstar” 2004 winner “Elli”, electro-pop pioneers "I like it Electric" & “Swiss DJ-legend “Leon Klein”.

[17] Two performances set her unique note; one with shooting star Adam Joseph, who recently worked with Bob Sinclar.

Together with her songwriter, Claudia co-wrote four songs for Tanja's first artist album, A trip to Bikini Island: Catwalk, Save me (Radio Edit), Wet & DNA (Don't need anything).

Since, more than once, presenters introduced her as Claudio D'Addio, which is the male form of Claudia and since many others mispronounced her name, she and her management decided to use an artist name for her debut album.