Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/16
M:2/4
K:G
['G2Bd g2f2 e2c2c2 Bc', 'G2 AGFE DEFG BGdB g2AB cBAB cAag', 'B,2 E2E2G2G2 F2F2 B4 A2G2F2E2 ^DEF=D B,2B,2', 'G2Bd g2f2 e2c2c2 Bc']  
X:1
L:1/16
M:2/4
K:G
 D2 | G2Bd g2f2 | e2c2c2 Bc | dcBA GABG | AGFE D3 D | G2Bd g2f2 | e2c2c2 Bc | cBec d2F2 | G4 G2 |] 
 !fermata!FG | AGFE DEFG | BGdB g2AB | cBAB cAag | f2d2d2 cB | c2c2A2A2 | dedc B2AB | A2a2a2g2 | 
 f2d2"^D.C."d2 |] B,2 | E2E2G2G2 | F2F2 B4 | A2G2F2E2 | ^DEF=D B,2B,2 | G2G2F2F2 | E2E2 e4 | 
 dcBA G2F2 | E6"^D.C." |] D2 | G2Bd g2f2 | e2c2c2 Bc | dcBA GABG | AGFE D3 D | G2Bd g2f2 | 
 e2c2c2 Bc | cBec d2F2 | G4 G2 |]  