Actually Edbert, your example of a pentatonic scale is wrong for a major pentatonic scale.
 The step interval is whole, whole, whole + 1/2, whole, whole + 1/2. 
 You indicated an E pentatonic scale is 
 E, G, B, A, D although in the music world, it is:
 E, F#, G#, B, C#, E     
 
    PS - Edbert, go back and listen to your Good Charlotte, and give up on understanding music (sorry Kosmo, I couldn't resist)