Originally Posted by: joe scaleneSecond thing is I just discovered that G major scale have the same notes as E minor. the only difference is their root notes(JUst by moving the root note 1 1/2 step down. Is this applicable to all other scales.?

Yeah. Usually the harmonic (or melodic) minor scale is used instead. Just because the E minor scale can sound too much like G major. Both the HM and MM scales have a tonality that sets for a different and more minor quality.