Quote:
Originally Posted by felixdcat
I play 1-3-5-7 of a C chord, and then I connect it to B major, because 7th of C major is 1st of C chord?
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I think you meant to say "7th of C major is 1st of B chord,"
Anyway, no, because B major contains two notes that aren't in the C major scale (D# and F#). As you said, you could flat the 3rd to be D instead of D#, but you'd still have F# which is out of key.
I'm not saying it's impossible to include 'out of key chords'. Everything is possible in music - you just have to find a convincing way of doing it.