Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
M:4/4
K:G
['DEFA G2 BG ABcA BcdB cdec', 'dGBd gabg agfg de e2 abag (3efg']  
X:1
L:1/8
M:4/4
K:G
 DG G2 GABc | d2 ba gedB | eA A2 ABAG | FG (3AGF DEFA | G2 BG ABcA | BcdB cdec | dGBd gdBd | 
 cedc BGFE | DG G2 GABc | dg g2 gfed | eA A2 ABAG | FGAF DEFA | G2 BG ABcA | BcdB cdec | 
 (3Bcd ^cd gBdB | cedc Bdef || gG G2 dGBd | gabg agfg | de e2 abag | (3efg af defa | bagb agfa | 
 gfeg fedf | edce dcBd | cedc Bdef | g2 GB dGBd | gabg agfg | de e2 abag | (3efg af defa | 
 bdgb adfa | gceg fAdf | eAce dGBd | cedc BG G2 ||  