Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:4/4
K:D
['(3.F.G.A DF ADFA', 'f4 (3gbg eg (3.f.g.a dA BGAF']  
X:1
L:1/8
M:4/4
K:D
|: (3.F.G.A DF ADFA | FAdf a4 | (3gbg eg (3.f.g.a dA | BGAF EFGE | (3.F.G.A DF ADFA | FBdf a4 | 
 (3gbg ec dABG |1 F2 D2 D3 z :|2 F2 D2 D2 (3abc' || d'aec dAFA | dAeA f4 | (3gbg eg (3.f.g.a dA | 
 BGAF EFG z | d'aec dAFA | dAeA f4 | (3ege ce dABG | F2 D2 D3 a | d'aec dAFA | dAeA f4 | 
 (3gbg eg (3.f.g.a dA | BGAF EFGE | (3.F.G.A DF ADFA | FAdf a4 | (3gbg ec dABG | F2 D2 D4 ||  