What does this mean? I know it means the song is in Ab or Fm key. Does it mean all the notes typed only on that line are a half tone lower? Or does it affect the octaves too? What frets should I be playing differently from the C key then?
A big thanks!
Yes, it affects octaves too. All A, B, D and Es are flats.

Every octave.

Originally Posted by Draekon

A song im very good at is Raining Blood!
"RAINING BLOOD! from a lacerated sky! Bleed is Horror! I bleed destruction, and now i shall REIGN IN BLOOD!!!!!!!!!!!!!!!!!!!"
Is that what he says?
you shouldnt be playing in the C key, otherwise that'd be C phrygian!
the good thing about the guitar is that each fret is a semitone above the last one, so you don't have to change anything - just start your C major scale from the note Ab, and use the same pattern, that'll be Ab major.
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Yes, it affects octaves too. All A, B, D and Es are flats.

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thanks for the compliment man!