Lisa's songs, as others have said, serve a purpose to get you changing chords on time and in rhythm.

But- if you'd like to practice with other songs, there is a list of recommended songs under each chapter that goes along with the level you are at. Under Chapter Four, the recommended songs are:[br]Simple Man (Made Easy), Speed of the Sound of Loneliness (Made Easy), The Boys Of Summer (Made Easy), Every Rose Has Its Thorn (Made Easy), I Am A Man Of Constant Sorrow (Made Easy), Wide Open Spaces (Made Easy),

I'm doing both Lisa's songs and trying out the other recommended songs. It all helps!