This is the free version. - It presents more than 150 Music Scales from music around the world that are useful for any musician playing any kind of music on Guitar. - It shows how each scale is written on the staff including the names of the notes and the Pattern of the Scale. - You can listen to the scale. - It shows the notes of each scale on a virtual Guitar so you can play it. - It presents two shapes to play each scale on two octaves on the Guitar. - You can select the device you are