Scales are the foundation of all lead guitar work and make it easy for you to crank out awesome single-note melodies. When people start to learn guitar scales they unwittingly cross a 'bridge' and start understanding music theory. This makes you a significantly better guitarist because you start to truly understand the instrument. A scale is a series of steps between two fixed musical points. These two fixed points are always the same note but in different octaves. We call these points "root notes".Scales are the foundation of all lead guitar work and make it easy for you to crank out awesome single-note melodies. When people start to learn guitar scales they unwittingly cross a 'bridge' and start understanding music theory. This makes you a significantly better guitarist because you start to truly understand the instrument. A scale is a series of steps between two fixed musical points. These two fixed points are always the same note but in different octaves. We call these points "root notes".