Well I am confuse about shreding. First I thought it was a power chord being alternately pick. Second a friend told me its a very fast solo and the third is a muted sweeping. Could anyone tell me which is which...

Second 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.?