Chord progression

[ZeroSkillz]

Ok, I've read the FAQ and searched the web, but I can't find a yes/no answer to this question...

If I use a chord progression in the key of C major like: C-G-Am-F. Both G and F has notes that's not in the key of C major (Bb,F#). Are those keys not to be used or does the progression from one key to another change the notes within the key?

edit: nevermind I'm useless...found the answer on same page

 

[bandcoach]

and that answer would be that the chords F and G are found in the scale of C major but the notes that are only found in the scale of F or G major are not

i.e.

	Chords
Scale	Tones	I	ii	iii	IV	V	vi	viib5
C	C-D-E-F-G-A-B-C	C-E-G	D-F-A	E-G-B	F-A-C	G-B-D	A-C-E	B-D-F
G	G-A-B-C-D-E-F#-G	G-B-D	A-C-E	B-D-F#	C-E-G	D-F#-A	E-G-B	F#-A-C
F	F-G-A-Bb-C-D-E-F	F-A-C	G-Bb-D	A-C-E	Bb-D-F	C-E-G	D-F-A	E-G-Bb

C major has no F# or Bb

 

[igormiskovic]

Only Chord Tones are important.

F= F A C
G= G B D

It is all inside Cmajor tonality.