Alexandra Sieti was born in 1994 in Thessaloniki. She started taking interest in music, dance and theater at a very young age. In 2007 she began studying music theory, harmony and piano at the Music College in Thessaloniki, while in 2011 she began studying Jazz singing at the Contemporary Conservatory of Thessaloniki with teacher Vicky Almazidou.
In 2014-2016 she participated, receiving an honorary distinction, in a Jazz Masterclass of the New Bulgarian University of Sofia with Billy Cobham, Milcho Leviev, David Murray, Craig Bailey, Marc Halbeer, Grigoris Simadopoulos and Vicky Almazidou, as well as in Jazz improvisation seminars  with Sheila Jordan (2014) and Thana Alexa (2019).
In 2016, she recorded for the first time with George Avramidis on the album "Voyager", to be followed in 2018 by their second collaboration album entitled "Invented Memories" and the singles "Blind Week" and "Phoenix" (2021). She is also featured on Cayetano's record “Melanie”, with the track “My Job is Done” (2018).
At the same time, she performs live with The Dude (soul, funk), as well as with leading jazz musicians of the country (Haris Kapetanakis, Dimitris Angelakis, Nikos Vargiamidis, Oleg Chaly, Alkis Karyzonis, etc.)
In 2018 she became a member of Souled Out with whom she toured throughout Greece and abroad, while in 2021 the singles "Let Me In Your Heart" and "Madness" were released together, receiving the best reviews. In 2022 they released their third single "Love School", as well as their full album entitled "Sunny Side Up".
In 2019, she begins to collaborate with Dionysis Savvopoulos in the musical show "At Woodstock I Was Here" together with Stavros Lantsias, Giotis Kiourtsoglou, Sakis Dovolis and Claudia Papadopoulou. They appear for the first time at the Sani Festival, while they continue for an entire sold out season in Alsos, and a concert in the Garden of the Athens Concert Hall (2021).
In 2021, she participates in the television show "The Voice of Greece" where she takes second place, with a purely soul, blues and rock repertoire.
In 2022 she sings with Foivos Delivorias and Giorgos Avramidis in the context of concerts in the region of Macedonia.
In June 2022, she is opening the Grammy nominee's Beth Hart concert.
In July 2022, she performs three concerts at the Athens Epidaurus Festival performing a "Tribute to Ray Charles" accompanied by the internationally renowned Giorgos Kontrafouris, Vassilis Podaras and Michalis Tsiftsis.