Major scale chords

Dazza1974

the chords in a major key of G are Am,Bm,C,D7 ,Em, F#something

why does F work ? for instance G,F and C in the key of G is great for blues and major scale soloing.

Also G, BFlat and C 

whats the relationship between these chords? I am a theory Neanderthal 

Lestratcaster

Cos they're borrowed from a parallel minor scale meaning you can use F, Bb and C chords that also contain notes in the minor pentatonic scale too (flat 3rd, 4th and flat 7th). 

sm55onl

G Major scale
http://www.guitar-chords.org.uk/guitarscales/g-major-scale.html

• G Major Scale Notes: G A B C D E F#
• Scale Formula: 1 2 3 4 5 6 7
• Scale Intervals: W W H W W W H

G Major chord progression
http://www.guitar-chords.org.uk/chords-key-g.html

G (natural) minor scale
http://www.guitar-chords.org.uk/guitarscales/g-natural-minor-scale.html

• G Natural Minor Scale Notes: G, A, Bb, C, D, Eb, F
• Scale Formula: 1 2 b3 4 5 b6 b7
• Scale Intervals: W H W W H W W

G minor pentatonic scale
http://www.guitar-chords.org.uk/guitarscales/g-minorpentatonic.html

• G Minor Pentatonic Notes: G Bb C D F
• Minor Pentatonic Scale Formula: 1 b3 4 5 b7
• Scale Intervals: W+H, W, W, W+H, W

[Edit: added]

G Blues scale
http://www.guitar-chords.org.uk/guitarscales/g-bluesscale.html

• G Blues Scale Notes: G Bb C Db D F
• Blues Scale Formula: 1 b3 4 b5 5 b7
• Scale Intervals: W+H, W, H, H, W+H, W

Make the Blues scale

https://www.guitarlessons.com/guitar-lessons/blues-guitar-quick-start-series/how-the-blues-scale-is-made

Also, (jazz) chord construction
http://www.jazzguitar.be/blog/jazz-guitar-chord-theory/

[Edit 2]

Blues Scale
http://www.howmusicworks.org/406/Scales-and-Melody/Blues-Scale

Steve-O

You are asking why the note F works well in a G major scale instead of the F# right?

I think I understand your confusion as a theory novice myself.

My take is the F note is the seventh of the scale (the major seventh) 
With F# you get the dominant seventh. 

so G,B,D,F     Major seventh 
     G,B,D, F#  Dominant seventh 

The dominant seventh is a kind of neutral note and can be played over both major and minor chords. So you can play F over G maj or G min and it won't sound like a bum note.

ArchtopDave

Steve-O said:

You are asking why the note F works well in a G major scale instead of the F# right?

I think I understand your confusion as a theory novice myself.

My take is the F note is the seventh of the scale (the major seventh) 
With F# you get the dominant seventh. 

so G,B,D,F     Major seventh 
     G,B,D, F#  Dominant seventh 

The dominant seventh is a kind of neutral note and can be played over both major and minor chords. So you can play F over G maj or G min and it won't sound like a bum note.

You have got it the wrong way round. F Sharp is the Major Seventh, so this note gives you G Major 7. F is the flattened 7th, giving you a Dominant Chord. The flat 7, I.e. F in this case, works in Blues, because a basic Blues Progression is a series of Dominent Chords.

EricTheWeary

Steve-O said:

You are asking why the note F works well in a G major scale instead of the F# right?

I think I understand your confusion as a theory novice myself.

My take is the F note is the seventh of the scale (the major seventh) 
With F# you get the dominant seventh. 

so G,B,D,F     Major seventh 
     G,B,D, F#  Dominant seventh 

The dominant seventh is a kind of neutral note and can be played over both major and minor chords. So you can play F over G maj or G min and it won't sound like a bum note.

The dominant 7th is, to some extent, the sound of blues and jazz - so heard a lot in popular western music for the last 80 years. So we probably find it easier on our ears than the major 7th ( any one time traveling from 200 years ago might find it less pleasant). It is still slightly dissonant which is what gives it that restless quality - so if you hear a dominant 7th chord you then want to hear it resolved. In that sense it actually doesn't work - it's a kind of not working that we like though. 

Edit : in this case the F is the dominant 7th as Dave points out. 

Phil_aka_Pip

The F# something is the half-diminished chord aka F#-7-5 or F#m7(b5).

Don't confuse the use of 'Dominant'. The 'Dominant' note in the Gmaj scale is D. When you harmonise the D you get D dominant 7 (R 3 5 b7, D F# A C). That formula is known as the Dominant 7th form of a chord. The leading note of the G scale (F#) is the 7th degree of the scale, F natural would be the flattened 7th or minor seventh as an interval calculated from the root G.