1. how can i know/recognize what scale for example this song is? it definitely doesnt sound happy" so i guess it'S no MAJOR scale.
2. e.g. i use the following scale A Minor (seems to sound dark):

SHALL i use ONLY notes in this scale so it wont sound out of keys?
3. if yes, where shall be the kicks/hihats/snares? i guess with the ROOT key? here Ab? or may i transpose them? if so how much? +6 -6?
4. what about the bass? i read that power chords play is the best e.g. 1 then 4th key and then 7th key? or is there no rule and i can play the bass the same as the rest keys?
5. is scale and a chord the same?
thanks