Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
Q:1/8=200
M:2/4
K:D
['dg g/f/g/e/ dg B2 Af', 'A/d/f fa ag g/f/e', 'D/G/B BB']  
X:1
L:1/8
Q:1/8=200
M:2/4
K:D
|: dg g/f/g/e/ | dg B2 | Af f2 | Bg g2 | dg g/f/g/e/ | dg B2 | Af af | gg g2 :: A/d/f fa | 
 ag g/f/e | A/c/e eg | gf fe/d/ | A/d/f fa | ag g/f/e | A/c/eA/c/e | dd d2 :: D/G/B BB | D/G/B BB | 
 =c/B/A c/B/A | GB ed | D/G/B BB | D/G/B BB | =c/B/A c/B/A | G2 g2 :|  