Greeting TalkBass! Ive been lurking on TB for a while now, with this being my first post. Well, Ive been looking into theory several times now, and Ive developed an understanding of most of the structures and whatnot of it, but I havent quite figured out how they all play together. The major thing that really confuses me at this point is key signatures and scales. I know what they are, but when I try to link them together and with music, I have no idea. So the question for me is, what is the relationship between key signatures and scales, and their overal relation to music? Do songs 'generally' use a single scale throughout, or is there a certain selection decided with the key? Also, how big of an influence do the key and scale(s) have on an overall song? Say if I wanted to use a note excluded from the scale, how does that work? And one last question; how do you work out chord progressions? I actually have a haze of an idea, but its bare boned, and possibly dislocated. Thanks for the help; I hope I made everything clear!