#1
if i want to write a song in a certain key how do i know what chords are in within that key
#2
1, 4, 5 always major. 2,3,6 always minor. 7 is diminished. this is for a major key anyway.

Key of C Major
C - Major - 1 chord
D - Minor - 2 chord
E - Minor - 3 chord
F - Major - 4 chord
G - Major - 5 chord
A - minor - 6 chord
B - diminished - 7 chord
#3
well, you need to know the key youre in, and what notes it contains. if you need a complete list, check out my site (in the sig), and go to keys. most importantly, the circle of fifths lesson.
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Quote by freedoms_stain
I can't imagine anything worse than shagging to Mark Knopfler.

Maybe shagging Mark Knopfler, but that's about it.
#5
D E F# G A B C#
D
Em
F#m
G
A
Bm
C#dim
My Gear:
Gibson Faded Flying V
"Dante's Inferno" Iceman
Fender Hot Rod Deluxe 112
etc.




Quote by freedoms_stain
I can't imagine anything worse than shagging to Mark Knopfler.

Maybe shagging Mark Knopfler, but that's about it.
#6
is there a certain order in which i have to strum those chords or could i just pick any order?
#8
Remember, there are no rules in music. None. You can play whatever the hell you want at any time you want, and it's not wrong. Now, "sounding good" (which is an incredibly vague term, I know. by "good" I mean most people in the west would say "ooh pretty" or something.) is a whole 'nother story...
#9
Learn to harmonise the scale by stacking thirds. Then you'll be able to find the chords to go with any scale.