In addition to the standard four difficulty levels (Easy, Medium, Hard, and Expert) for each song and instrument, a new Beginner level has been added in "World Tour". This difficulty is aimed for younger and unskilled players; notes are generally simple straight lines in time with bass drum beats, and allowing any or no fret button to be held while the note is strummed (for lead and bass guitar), any drum to be hit (for drums), or any sound to be made (for vocals).