As explained by Amarok that marks the song several artists. For example, in Foobar is done as follows : "Ice Cube; Shokhop". After this song appears in the back Ice Cube, and Shokhop branch. Amarok understands the game as follows : "Ice Cube Shokhop" I am Russian. The text translated Google Translate

If you search the forum you will already find at least on thread that covers this topic. There is still discussion going on about how to solve this.