Construct a music composition that complies with the designated structure and theme.
X:1
L:1/8
M:4/4
K:G
['', 'e c2 B', 'cAGE [GD]4 [G,D]4 DEGA BAGE C3 D'  
X:1
L:1/8
M:4/4
K:G
 gf |: e c2 B c2 cB | cdef g2 BA | G2 GA BAGF | GABc d2 gf | e c2 B c2 cB | cdef g2 ef | 
 gfga gfed |1 e c2 B c2 gf :|2 e c2 B c4 |: C3 D E2 G2 | cBcd cAGE | [GD]4 [G,D]4 | DEGA BAGE | 
 C3 D E2 G2 | cBcd edef | gfga gfed | e c2 B c2 c2 :|  