In 1973, he joined the folk rock band Wolna grupa Bukowina founded by Wojciech Belon and remained one of its members for four years.

[1] Since his debut in 1979, Lorenc has composed music for more than 150 feature films, documentaries, TV series and theatre performances.

[2][3] The films and TV series in which his film scores appear include Sekal Has to Die, Little Rose, 300 Miles to Heaven, A Prominent Patient, Ojciec Mateusz, Bastard, Fotoamator, Four Nights with Anna, Kołysanka, Exit in Red, Kanalia, Sauna, Kroll, Deborah, Przedwiośnie, Żurek, Glina, Złoto dezerterów, Amok and Nic.

In 1996, he wrote the score for Bob Rafelson's film Blood and Wine starring Jack Nicholson, Jennifer Lopez and Michael Caine.

[4] In 2016, to celebrate the 1050 anniversary of the Baptism of Poland as well as the opening of the Temple of Divine Providence in Warsaw, an album entitled Przymierze containing Lorenc's music works was released.