His musical style is broadly referred to as outsider art or art brut .
Willis has often been compared to other artists with cult followings such as Roky Erikson of the 13th Floor Elevators and Daniel Johnston .
Willis ' musical style is broadly referred to as outsider art or art brut .
Willis has often been compared to other artists with cult followings such as Roky Erikson of the 13th Floor Elevators and Daniel Johnston .