Formulate chord combinations to increase the harmonic complexity of the specified musical excerpt.
G3/2 ^F/ G | .c .c .c | E3/2 ^D/ E | .G .G .G | (g2 f) | (f2 d) | (e2 B) | c3 | 
 G3/2 ^F/ G | .c .c .c | E3/2 ^D/ E | .G .G .G | d/e/ f/g/ a/g/ | (e2 c) | 
{/c} B3/2 A/ B |1 c2 z :|2 c c z d |:[K:G] d3/2 e/ d | c' a/f/ d | d3/2 e/ d | 
 d' b/g/ d | (F .e) .e | (d2 D) | (D c) .c | (B2 G) | d3/2 e/ d | c' a/f/ d | 
 d3/2 e/ d | d' b/g/ d | G B d | g f/e/ d | (d/c/) (c/A/) (F/A/) |1 G z d :|2 G z g |: 
[K:C] (c'2 e) | (b2 a) | (d3 | d) .e .f | (b2 a) | (g2 f) | e3 | z z g | (c'2 e) | 
 (b2 a) | (d3 | d) .e .f | (b2 a) | (g2 B) | (c3 |1 c) z g :|2 c z c |: 
[K:F] a/a/ a/a/ a | .a .g .f | g/g/ g/g/ g | c (d/c/) (d/c/) | .b .a .g | 
{/a} g ^f .g | (a/c'/) .c' .c' | (e/c'/) .c' .c' | a/a/ a/a/ a | .a .g .f | 
 g/g/ g/g/ g | c (d/c/) (d/c/) | .b .a .g |{/a} g .^f .g | f3/2 f/ f |1 f z c :|2 
 f z z |]  
X:1
L:1/4
M:3/4
K:C
"C" G3/2 ^F/ G | .c .c .c | E3/2 ^D/ E | .G .G .G |"G7" (g2 f) | (f2 d) |"C" (e2 B) | c3 | 
 G3/2 ^F/ G | .c .c .c | E3/2 ^D/ E | .G .G .G |"G7" d/e/ f/g/ a/g/ |"C" (e2 c) | 
{/c}"G7" B3/2 A/ B |1"C" c2 z :|2"C" c c z d |:[K:G]"D7" d3/2 e/ d | c' a/f/ d |"G" d3/2 e/ d | 
 d' b/g/ d |"D7" (F .e) .e | (d2 D) | (D c) .c |"G" (B2 G) |"D7" d3/2 e/ d | c' a/f/ d | 
"G" d3/2 e/ d | d' b/g/ d | G B d | g f/e/ d |"D7" (d/c/) (c/A/) (F/A/) |1"G" G z d :|2"G" G z g |: 
[K:C]"C" (c'2 e) | (b2 a) |"Dm" (d3 | d) .e .f |"G7" (b2 a) | (g2 f) |"C" e3 | z z g | (c'2 e) | 
 (b2 a) |"Dm" (d3 | d) .e .f | (b2 a) |"G7" (g2 B) |"C" (c3 |1 c) z g :|2 c z c |: 
[K:F]"F" a/a/ a/a/ a |"Dm" .a .g .f |"Gm" g/g/ g/g/ g |"C7" c (d/c/) (d/c/) | .b .a .g | 
{/a} g ^f .g |"F" (a/c'/) .c' .c' |"C7" (e/c'/) .c' .c' |"F" a/a/ a/a/ a |"Dm" .a .g .f | 
"Gm" g/g/ g/g/ g |"C7" c (d/c/) (d/c/) | .b .a .g |{/a} g .^f .g |"F" f3/2 f/ f |1 f z c :|2 
 f z z |]  