Roots of Krzysztof Krawczyk

Natalia Maria Kukulska is a Polish singer performing pop and R&B music, turning towards alternative electronica in the 2010s. She debuted as a child singer in 1986, and released her first "adult" solo album in 1996. Her most popular songs include "Dłoń", "Piosenka światłoczuła", "Im więcej ciebie tym mniej", "W biegu", and "Wierność jest nudna". She has sold over 1.8 million albums as of 2014 and received three platinum records and six gold records.

Edyta Małgorzata Bartosiewicz is a Polish rock singer, composer, and songwriter. In Poland, she's known for her highly reflective and unusual lyrics. Sixteen of her singles reached the top of Polish Radio charts. Over the course of her musical career, she has received five Fryderyk awards – the most important recognition in the Polish music industry.

Julio José Iglesias de la Cueva is a Spanish singer and songwriter. Iglesias is recognized as the most commercially successful Spanish singer in the world and one of the top record sellers in music history, having sold more than 300 million records worldwide in 14 languages. It is estimated that during his career he has performed in more than 5,000 concerts, for over 60 million people in six continents. In April 2013, Iglesias was inducted into the Latin Songwriters Hall of Fame.