Recognized within Estonia for her genre-bending style, Nurmsalu has garnered success as both the lead singer of Urban Symphony and as a solo artist.

Nurmsalu rose to prominence in Estonia during her participation in the 2007 edition of the Eesti Televisioon (ETV) talent competition Kaks takti ette.

[2][5] Nurmsalu began her professional solo career in 2007, competing in the Eesti Televisioon (ETV) singing competition Kaks takti ette.

[2] During a special week of the competition where contestants were told their performances must be as part of an ensemble, Nurmsalu formed the group Urban Symphony with other stringed instrument musicians from her music school.

The group's performance of "Hungry" by Kosheen blended classical crossover with electronic music; this sound became associated with Urban Symphony and Nurmsalu for the rest of their careers.

[8] After signing to Moonwalk shortly after Kaks takti ette, Nurmsalu and Lõhmus decided that she would continue performing with Urban Symphony instead of pursuing a solo career.

In December 2008, Urban Symphony was revealed to be taking part in the debut edition of Eesti Laul, the newly created program to select the Estonian representative in the Eurovision Song Contest.

[11][12] As the winners of Eesti Laul, Urban Symphony received the right to represent Estonia in the Eurovision Song Contest 2009 in Moscow, with "Rändajad".

She performed guest vocals on the single "Sel teel" by Estonian musician Sinine; the song went on to become a top ten hit in Estonia, and also received airplay in France and Germany.

On 26 September 2013, "Väike Eestimaa" was officially released by Moonwalk Studios and included an announcement that Nurmsalu was working on a new album with her former producer Lõhmus.

Kask is additionally a former physical education teacher, has composed songs for Nurmsalu and other musicians, and ran for leader of the Estonian Free Party.