Craft a composition that integrates the assigned alphabet-related musical pattern and the provided melodic theme.
X:1
L:1/8
M:4/4
K:G
['g3 f gdBd', 'BA GABd gage |1 fdcA AGAB :|2']  
X:1
L:1/8
M:4/4
K:G
 g3 f gdBd | g2 dg fgaf | g3 f gdBd |1 ecAc BGBd :|2 ecAc BGAB |: GB B2 G2 ge | fddc A2 BA | 
 GABd gage |1 fdcA AGAB :|2 fdcA AGBd ||  