Jandová provides additional vocals on the song "Undivided" from Dog Eat Dog's 2006 release, Walk With Me, "Horizont" from In Extremo's album Mein Rasend Herz, "Wie weit/How far" from Apocalyptica's self-titled album and the 2010 single "Halt dich an mir fest" with Revolverheld from the album In Farbe.
Happy Days | Die Zeit | Die Welt | Die Fledermaus | Happy Chandler | Happy Valley | Funny or Die | Die Hard | Die Walküre | Die Entführung aus dem Serail | Die Flippers | Happy Mondays | Die Meistersinger von Nürnberg | Die Toten Hosen | Die Krupps | Die Frau ohne Schatten | Get Rich or Die Tryin' | Die Hard 2 | Die Fantastischen Vier | Trigger Happy TV | second happy time | Live Free or Die Hard | Happy Tree Friends | Happy Meal | Get Rich or Die Tryin' (film) | Happy-Tom | Happy Feet | Die Haut | Die Ärzte | These Happy Golden Years |