Unless you have studied a good amount of music theory and are very familiar with how the interval relations are laid out on the guitar, then chances are you can’t calculate a scale or mode by yourself. Most guitarists can’t, which is why learn how to play guitar online are such an important tool for guitarists.

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A guitarist that knows a bunch of different scales and modes can easily achieve a level of diversity in their playing that would be very difficult with purely mechanical techniques. You basically can’t play jazz guitar without a good knowledge of the major scale and the associated modes of it.

It is quite important to learn all the various guitar techniques from guitar lessons for beginners online in order to play expressively, but knowing the scales and modes is also an important factor. You could play the exact same melody in two different scales or modes and get a very different feeling from it. This is even specifically used in some songwriting. When you first start out, free guitar scales charts lessons focus more on teaching the mechanical aspects of guitar playing. However, moving up to a more intermediate level of guitar playing also requires learning how to apply those mechanical techniques, which makes knowledge of scales and modes very valuable.

A new guitarist should get a feel for the various scales and modes as soon as they can, using free guitar scales charts rather than waiting until they have developed a sufficient level of theory knowledge to calculate them themselves.

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Once you have a few charts try taking a new scale or mode and using it with the techniques from free guitar scales charts. A lot of virtuoso guitarists get their sound from applying expressive scale and mode usage with expressive mechanical techniques.