is a Polish composer of symphonic pop music for orchestra, film and theatre as well as conductor, music producer and vocalist. He gained nationwide popularity in the mid-2000s with the success of his songs Niech mówią, że to nie jest miłość (2005) and Psalm dla Ciebie (2006). 
Rubik learned to play the cello from the age of 7, went on to a musical secondary school, and then studied at the Fryderyk Chopin Academy of Music in Warsaw. Later he became a member of the world-class orchestra Jeunesses Musicales. He studied film score composition in Siena, Italy, under Ennio Morricone.

Piotr Rubik worked with various Polish artists and musicians, such as Edyta Górniak with "Dotyk". He also did work on film tracks and television. His most popular songs have been Niech mówią że to nie jest miłość (Let them say it's not love), Psalm dla Ciebie (Psalm for You), Most Dwojga Serc (Bridge of Two Hearts), Nie Wstydź się mówić że kochasz (Don't be afraid to say that you love), and Miłość cierpliwa jest, lecz i nie cierpliwa (Love is patient, yet impatient).

Rubik has also performed in North America numerous times since September 2007. In October–November 2010, the composer and conductor went on a tour of 17 concerts in the US and Canada, starting in Trenton, New Jersey, and finishing the tour in Chicago, Illinois. 
His magnum opus to date is the oratorio Tu Es Petrus, Latin for "You Are Peter", which he dedicated to Pope John Paul II. It forms only one part of his "Tryptyk Świętokrzyski" (Holy Cross Triptych) which he composed to texts written by Zbigniew Książek. The other parts are Oratorium Świętokrzyska Golgota (Holy Cross of Golgotha) and Oratorium Psałterz Wrześniowy (September Psalter) with Tu Es Petrus forming the second part.