I've been messing around with this thing they call "voice leading" and I ran upon something. Is it common to lead an augmented iii back into the tonic? I was messing with it and it sounds okay, but I've rarely seen it in songs or articles on chord progressions. Another question that's bugged me- I know when people play a "Blues riff in G" the first chord is more than likely G7, and the mixolydian or pentatonic blues are used, something I do quite often, but why is it in G? If you rock the pentatonic, the minor 3rd in there should make it in Bb, am I wrong? Hit me up with knowledge.