Re: Playing a Seven Chord
Christian, in the key of G, F major is called the "flat 7." The 7th degree of the G major scale is F#, so if a song in G major called for a 7 chord, you would play F#m7b5. The anomaly is in the nomenclature for a "7th" chord. G7 is spelled G B D F; the 7th chord with the scalar 7th is called Gmaj7. 7th is the only chord name for which the assumption is a flattened 7th unless indicated otherwise. For example:
G7 = G B D F
Gmaj7 = G B D F#
Gm7 = G Bb D F
Gm(maj7) = G Bb D F#
7th is also called dominant 7th, and any 7th chord can be extended with the 9th, 11th, and/or 13th.
BTW, in your song, the progression is I bVII (not vii°) I IV I V I. The F chord is correct.
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