Invaluable for Mel Bay Bass Scales Wall Chart Guitar Center (PDF) This wall chart contains four movable scale diagrams for each scale on thestring bass Learning and practicing 2 Mel Bay Bass Scales Wall Chart Guitar Center offers. Learning and practicing these scales will allow you to play the correct notes when creating bass lines, and will provide you with a solid musical foundation The bass scales chart below shows three common bass scales (pentatonic minor, blues and major) as patterns on a