Develop a musical composition using the outlined alphabetical depiction of the structure and the provided theme.
X:1
L:1/8
Q:1/8=180
M:4/4
K:G
['BGEF G2', 'gfga beeg fdad fddf']  
X:1
L:1/8
Q:1/8=180
M:4/4
K:G
 A | BGEF G2 (3DEF | G2 BG EFGc | BGEF G2 Bd | gefd Beed | BGEF G2 (3DEF | G2 BG EFGc | 
 BGEF G2 Bd | gefd Bde || f | gfga beeg | fdad fddf | gfga beef | gfed Bdef | gfga beeg | 
 fdad fddf | gbba faaf | gfed Bded ||  