The following diagram shows the notes on the sixth string. Remember that all sharp notes can also be called flats and vice versa (e.g., C#= Db). Learn all these notes from memory and then play the following progression which uses power chords.
It is possible to harmonize (play other notes along with) any scale with power chords. To do this, you will need to know how to play the scale along one string. The following example uses an E major scale along the 6th string.
To learn more about major scales and scales in general, see Progressive Scales and Modes for Guitar . Experiment with moving power chords around within the scale and create your own chord progressions.
When using movable scale forms, it is important to be able to quickly find the correct fret at which to play each note, and also to be able to play equally well in all keys. The best way to achieve this is to memorize the names of all the notes on the fretboard.
This may seem a daunting task, but it can be done and will be well worth it. More advanced guitar playing requires the use of many different scales, chords and arpeggios, which may take their name from any of the six strings, so you need to learn them all equally well.