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.
Saari has often been labelled as the "King of Finnish Soul", but he has also worked with pop, rock and rap musicians such as Anna Puu, Elastinen, Jonna Tervomaa and Cheek.