2009: Sonata Arctica - The Days of Grays (vocals on tracks 2 and 9) (Deathaura, No dream can heal a broken heart)
A solo artist, he has also collaborated with a number of other artists such as Jonna Tervomaa, Jippu, Vuokko Hovatta, Anna Puu, Vesa-Matti Loiri, Jorma Kääriäinen, Kari Tapio and ja Johanna Kurkela.
Johanna Kurkela | Johanna Drucker | Johanna Gadski | Johanna Kustannus | Johanna Wokalek | Johanna Stegen | Johanna Spyri | Jóhanna Sigurðardóttir | Johanna Sibylla of Hanau-Lichtenberg | Johanna Reiss | Johanna Nichols | Johanna Magdalene of Saxe-Weissenfels | Johanna Harwood | Jóhanna Guðrún Jónsdóttir | Johanna Frisk | Johanna | Princess Johanna Charlotte of Anhalt-Dessau | Maria Johanna Görtz | Johanna Wanka | Johanna von Trapp | Johanna von Puttkamer | Johanna, Victoria | Johanna van Beethoven | Johanna Schopenhauer | Johanna Reiß | Johanna Ray | Johanna Lindsey | Johanna Kinkel | Johanna Jackson | Johanna Holmström |
Jani & Jetsetters, Katra, Jukka Kuoppamäki and Johanna Kurkela each performed two Finnish-language songs and one of Laura Voutilainen's two songs was sung in Finnish: the remaining fifteen songs were sung in English.