In 1997 he won the National French Song Contest (which was held in Radziejów) and received 1st place.

He also represented Poland in the International Festival "Singing Mask" and finished in 2nd place.

From 1998 he started to take part in hosting TV shows in Poland and he was also a semi-finalist in the Polish edition of Idol.

[1] In the first semifinal on 25 May 2010, Marcin Mroziński didn't qualify for the finals of Eurovision 2010 in Oslo.

He was a cast in following musicals: Media related to Marcin Mroziński at Wikimedia Commons