Try out these basic guitar scales. They will give you the foundation you need to start playing lead guitar. To make it basic, remember that the root note, or the first note the scale starts on, is the name of the guitar scale you will be playing. Memorize the pattern of the guitar scale. For example, if you learn the pattern for the major scale you can use it for any of the major chords. To explain further if the rhythm guitar is playing a C major chord you can play along using the major scale by starting on the C note as the first note in the pattern you have learned. The video's explain this in further detail and break it down to simplify it.