The estimated sale of all her albums is over one million copies, which puts her among the Polish artists with the largest number of music publishers sold in Poland.

Her musical experience began in the 1980s when she sang as a female vocalist for numerous Polish bands, including Human, Fatum and Talking Pictures.

A year later, Kasia went on a tour called "Koncert Inaczej" which consisted of live performances of songs from the "Gemini" album in slightly different versions and jazz recitals during which she performed her favorite jazz standards of Billy Joel, Barbra Streisand etc.

She also recorded a song to the soundtrack of a Disney movie, The Hunchback of Notre Dame – the prayer of Esmeralda.

The first song which promoted Czekajac na… (Waiting for..) was called "Cos optymistycznego" (Something optimistic) and it showed a side of Kasia that nobody ever knew existed.

By the end of the tour Kasia announced that she is pregnant (the father is a composer of a lot of songs on Czekajac na... and a known musician- Kostek Yoriadis).

Kasia often said that Jagged Little Pill of Alanis Morissette really inspired her to record an album filled with feminist views.

For the first time in her career, Kasia simply sings without going to the extremes of showing all her vocal abilities in one song.

[2] In 2001, she won the MTV Europe Music Award for "Best Polish Artist" and she was invited to sing on a Tribute album to a racing car driver – Ayrton Senna who died tragically in 1994.

This time Kasia worked on it with some of her good friends, respected musicians like Michal Grymuza who was also the producer of the album and Wojtek Pilichowski amongst others.

Instead of putting out a "best of" package, she recorded an entirely new album called Samotna w wielkim miescie (Lonely in a big city).

It includes a song "Somewhere Inside" written by Canadian singer Alannah Myles, known for her hit "Black Velvet".

On 25 October 2019 Kasia released album MTV Unplugged, which is a record of a legendary series concert that took place on 8 May 2019 at the Shakespeare Theater in Gdańsk.