[quote name='Dad3353' timestamp='1369825060' post='2093059']
No mystery; it's a red herring (again, imho...). It's not an exact science, and there's no 'formula' to apply. Different styles of music will 'allow' different harmonic structures and tools (although there's no rulebook, of course...). It would be out of place to play 'modally' over trad jazz, for instance. In pop/rock, the way our ears react is different (culturally...) to the way we listen to classical, or folk.
Arpeggios and intervals will get you a long way; listening (and ripping...) any 'genre' of music that you want to play will get you applying the stuff to 'real world'. The theory, although important, comes after the practical side. Don't practice 'theory', practice music, and use theory to understand/explain what you're playing/listening to.
Hope this helps.
[/quote]
Great answer.