I have been learning music theory for only a little over a year, so I’m sorry if the answer to this question is obvious…How does an A Chord fit into the key of G? A few weeks ago I took a stab at learning Ben’s beginner version of Life’s Railway to heaven on banjo. The song is TAB’d in the key of G, but the chord progression has a measure of “A major” thrown in there. (Am would be in the key if G) Until this point I was under the impression that if you veered away from the chords in a particular key that it wouldn’t sound correct. I can see now that is obviously not true. So now that the rules that I thought were hard rules have been broken, what are the rules for writing music or improvising in a particular key?