J.A.R. : Mein Kampfunk , Bonton 1997, background vocal
Sto zvirat : Nikdy nic nebylo ( Nothing Ever Happened ) , Animal Music 2004, as guest, vocal
J.A.R. : Armada spasu ( Salutation Army ) , Sony BMG/Columbia 2006, vocal
J.A.R. : Eskalace dobra , Warner Music Czech / Monitor 2017, rap