[quote name='Hector' timestamp='1474889173' post='3141226']
For improvising you can just play:
C major pentatonic
Bb lydian (i.e. with an E instead of an Eb), which is Fmajor from Bb to Bb.
This is borrowing a chord from closely related key of F major. So it's sort of a IV-I in disguise! You could play F major pentatonic over it,or even C blues scale material.
You see this a lot in jazz as Bb7 to C.
In that case play Bb lydian dominant (i.e. mixolydian with an E instead of Eb). That scale is actually a mode of F melodic minor, so Bb7 to Cmajor is really Fminor is disguise!
Fminor to Cmajor is IV minor to I major, used in lots of songs, including a ton of beatles tunes (e.g. in my life)
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Thats what I wanted to know...where it came from and how it sneaked in there.
Thanks