I'm writing a song and suddenly I noticed I'm singing a C♯ over an F major chord. It sounds good (I suppose), but I'm a bit worried about the tension.
I know it's common to sing the minor third over a major chord, but here I'm in between the fifth and the sixth of the F major scale.
This is occurring over a very simple progression: B♭ - E♭ - F - B♭. The style can be said to be blues and/or maybe a bit jazzy...