basically, if the songs in a major key, you use the corresponding major scale.. example, if the song is in the key of C major, you use the C major scale.. and if you are playing in a major key, you can always use the major penatonic scale if you work well with the pentatonic:
E Major Penatonic. (9th position)
e:-----------------------------------9--12
b:----------------------------9--12-------
g:---------------------9--11--------------
d:--------------9--11---------------------
a:-------9--11----------------------------
e:9--12-----------------------------------
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