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I know it on a piano,but not on a guitar. This is needed in order to understand what a major scale is? Could anyone also explain what major scales are? There are a ascending and descending scales... Is scales combinations of different notes?

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closed as unclear what you're asking by Dom, NReilingh Apr 22 '14 at 0:34

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.If this question can be reworded to fit the rules in the help center, please edit the question.

Why are there natural, harmonic, melodic and major scales? What differentiates them? – user139024 Apr 21 '14 at 23:39
This kind of looks like it may be better answered with a cursory search of Google and look at Wikipedia. Perhaps better would be for you to delineate just what confuses you about the explanations you've found rather than asking for a full tutorial be written here. – Hovercraft Full Of Eels Apr 21 '14 at 23:43
Scales consist of the same notes on any instrument... – Dom Apr 21 '14 at 23:43
This question really isn't answerable at present. Do you mean to ask which two modes differ by a semitone? Please check your definitions on Wikipedia -- this site is Q+A, not a dictionary. – NReilingh Apr 22 '14 at 0:37
up vote 1 down vote accepted

To answer specifically about notes which are half-step or whole-step apart, especially since you're familiar with the concept from the piano: Wherever you are on the guitar (meaning on any string at any fret):

  • going up by one fret on the same string, you go up by a half-step
  • going up by two frets on the same string, you go up by a whole-step

A key is a selection, or group, of notes – which is a broader subject in itself but most introductory articles will explain it. For example:

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It answers my question. I go google the rest for myself. Thanks – user139024 Apr 22 '14 at 1:08
That's why, by the time you've gone up in the steps TTSTTTS (the steps which make a major scale, just like on the piano), on guitar, you end up on the same note an octave higher. However, that's not the normal way to get around notes when playing guitar - all on one string. This is for illustration purposes only ! – Tim Apr 22 '14 at 6:54

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