Create a musical composition that adheres to the provided structure and theme.
X:1
L:1/8
M:4/4
K:C
['B2 Bd dcAc', 'fgaf gfeg fdcA'  
X:1
L:1/8
M:4/4
K:C
[M:2/2][K:G] .abc B2 Bd dcAc | BGGB d2 cA | B2 Bd dcAc | d2 cA BGGA | B2 Bd dcAc | BGGB d2 cA | 
 BABc dcAc | dBcA BGGe || fgaf gfeg | fdcA Adde | fgaf gfeg | fdcA AGGe | fgaf gfeg | fdcA Adde | 
 fefg abag | fdcA AGGA |]  