Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:2/4
K:G
['', 'dg dg', '.g2 .f2 .e2', '.a2 .g2']  
X:1
L:1/8
M:2/4
K:G
 D |:"G" GG/G/ GB | dd/d/ dg | dg dg | d3 B |"D7" AA/A/ Ad |"G" BB/B/ BG |"C" EE/E/ EF |"D7" D3 D | 
"G" GG/G/ GB | dd/d/ dg | dg dg | d3 B |"D" AA/A/ Ad | Ad fb |"A7" a/a/.a ^c/c/c |1 
"D" dd/d/"D7" dD :|2"D" dd/d/ dg |:"D7" (fe cd) | f3 e |"G" (ed Bd) | e3 d |"D7" .d.c .B.c | 
 .b2 .a2 | .d.c .B.c |"G" .a2 .g2 |"D7" (fe cd) | f3 e |"G" (ed Bd) | e3 d |"D7" dc BA |"G" ag fe | 
"D7" ed cA |1"G" G3 g :|2"G" G2 z2 |:[K:C]"C" (e4 | e>)e a>g | (c4 | c>)c f>e | G3 c | Bc d>c | 
"G7" (B4 | A2) z2 |"F" a4 | a>^g b>a | (a4 | a>)g f>e |"Dm" .e2 .d2 |"G7" .f2 .B2 |"C" (c4 | 
 c2) z2 :|"Am" ee/e/ ea | ea ea |"E7" ^ga bg |"Am" a^g .a2 |"G" dd/d/ dg | dg dg |"D7" ^fg af | 
"G7" .g2 .g2 |:"C" g2 g>g | .a2 .g2 | .f2 .e2 |"G7" d2 z2 | f2 f>f | .g2 .f2 | .e2 .d2 |"C" c2 z2 | 
"Am" e2 e>e |"A7" .f2 .e2 |"Dm" d>^c d>f | b3 a |"G7" .a2 .g2 |"C" .a2 .g2 |"G7" gf ed | 
"C" c2 z2 :|  