Like many beginners are I had problem with songs which were using difficult bar chords. I always wished if there is a way to simplify the chords. After searching the net and reading litle bit of theory, I found following procedure of changing the scale. As it may be useful for other guitarist, I decided to publish this over net. Though, let me state that it comes with a caution that changing scale will result in loss of some sheen from your music.
Following is the procedure of changing the chords
1. Prepare a matrix like below to identify the relation between the chrods and scale. (It should be available somewhere on net)
2. Find the scale of the song by looking at the chords used in the song and name the chords using the roman numbers
3. Look for other scale (most of the time you will end up with C or G scale, if the song is in major scale) which may have simpler chords with the same roman numbers
You can also go thru the theory in detail on link http://www.howmusicworks.org/hmw711.asp
Scale C D E F G A B
I C D E F G A B
ii Dm Em F#m Gm Am Bm C#m
iii Em F#m G#m Am Bm C#m D#m
IV F G A Bb C D E
V G A B C D E F#
vi Am Bm C#m Dm Em F#m G#m
vii Bdim C#dim D#dim Edim F#dim G#dim A#dim
I tried this with song - dheere dheer se meri jindagi me aana -
On net i found this song was using the chords G#m and F#,
I started looking for the scale which uses these two chords, which came out to be F#
and the roman name of these keys in F# major scale are (ii) & (I).
I changed the scale to Dmajor. Equivalent chords were D and Em
So I played the song with these keys and I found it pretty effective.
You may give it a try. Do send me your experience and result of any eventual experiment.