For years she has been invited to take part as a solist in such large music projects as Michael Jackson Symfonicznie, Whitney Houston Symfonicznie, Frank Sinatra Symfonicznie and Abba Symfonicznie. These concerts continue to attract significant interest what is demonstrated by full audience at the concert halls, philarmonies, amphitheatres and theatres.
In 2014 Karolina was invited to join a project of Multiplayer Ensemble band. It is Poland's first band to play computer games music score live with visualisations. The band comprises excellent young musicians, cheap replica watches graduates of academies of music in Poland and abroad who on a daily basis work with philharmonies and orchestras across the country. The reportoire includes original arrangements of computer games music scores selected from among the most popular game titles.
Multiplayer Ensemble "Ezio's Family" from Assassin's Creed II see video
Co-operation with Beethoven Academy Orchestra with guest performance of the jazz pianist Paweł Kaczmarczyk resulted in filming a video for Unforgettable under the conductor and arranged by Sebastian Perłowski.
Karolina Leszko & Marcin Jajkiewicz, Unforgettable arr. S.Perłowski see video
The artist has been pursuing her career not only in Poland but also abroad. In 2014 she established regular co-operation with several renown orchestras in Norway, among others Dragefjellets Musikkorps (Bergen Symphonic Windband), replica Audemars Piguet Tysse og Nordbygda Musikklag and Os Musikkforening. The co-operation redulted in concerts in Norway and Poland. The concert programmes include works of such artists as Aretha Franklin, Ray Charles or Carole King and jazz standards.
As a vocalist working together with the Anawa band, Karolina has on numerous occasions performed with Krakowska Młoda Filharmonia and with other symphonic orchestras at subsequent editions of the Grechuta Festival.