Chord Families and the Circle of Fifths

I'm doing an online music theory course at present and this tip about the Circle of Fifths jumped out at me.

Basically you can see the diatonic chord family for say C Major highlighted in Red.

So say you have a typical chord progression like this :-  C   G   Am  F  -   C  G   F   C    ( I  V  vi  IV     I  V  IV  I )

But  you need to transpose into  E Major instead 

Well the Circle of Fifths comes to your rescue as you can see from the highlighted Blue circle.

You now have 

E   B   C#m  A  -   E   B   A   E    ( I  V  vi  IV     I  V  IV  I )

So in songwriting if you want the family of diatonic chords that play well together then  it's a good start .

A simple little tip but I never knew about it until now.

I'm doing an online music theory course at present and this tip about the Circle of Fifths jumped out at me.

Basically you can see the diatonic chord family for say C Major highlighted in Red.

So say you have a typical chord progression like this :-  C   G   Am  F  -   C  G   F   C    ( I  V  vi  IV     I  V  IV  I )

But  you need to transpose into  E Major instead 

Well the Circle of Fifths comes to your rescue as you can see from the highlighted Blue circle.

You now have 

E   B   C#m  A  -   E   B   A   E    ( I  V  vi  IV     I  V  IV  I )

So in songwriting if you want the family of diatonic chords that play well together then  it's a good start .

A simple little tip but I never knew about it until now.

There is a way to remember the circle of 5th and 4ths.

Carolyn Gets Drunk And Eats Bees  Circle of fifths.

Carolyn  Fondles B E A D
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What you pointed out really helps when finding the chord you need.  Try this in the key of C. C major - Dm - Em - F major G major -  Bdim  Check out how the B dim resolves back into the C major.   

You can use any chords as long as they have the notes that are in the scale. You can use F major 7 as well as G7. Am7 ,  F9 , G9, Am9  etc...  Play around with different progressions using these chords. It will give you options when search of the "Mystery Chord"