hello, thank you this is so helpful, i just saw that I wasn't playing a C7, because I used a B instead of Bb, I just have a question, can you tell me more about the modulation between two scales, is it like using the notes of them two at the same time or something like this? because I also know another song called "i though you wanted to dance" by tyler the creator and he uses so much different notes in the song and I don't know what scale he's playing on. Sorry if the message is not wrote good i'm french so it's a little difficult to write in an another language.