Mabel - one of the most interesting British singers of recent years, winner of, among others, the Brit Award - British Female Solo Artist, Kacperczyk - their great album "Pokolenie Końca Świat" reached the top in Poland, and now it's time for Open'er, Kasia Lins - a gem of domestic alternative, Gruby Mielzky - shortly after the premiere of the latest album and Kaz Bałagane - one of the most expressive figures of contemporary Polish rap. The musical line-up of this year's edition of Open'er is closed!