Craft a composition that integrates the assigned alphabet-related musical pattern and the provided melodic theme.
X:1
L:1/8
Q:1/8=180
M:4/4
K:G
['B3 G AcBG AGEF (3GFE (3FED EFGB', 'GABc d2 ef g3 e dBGB', 'G2 (3GFG GABc d2 ef g3 e']  
X:1
L:1/8
Q:1/8=180
M:4/4
K:G
 Bc | decd B3 G | AcBG AGEF | (3GFE (3FED EFGB | AGBG AGEG | cdcA B3 G | AcBG AGEF | 
 (3GFE (3FED EFGB | ADFA G2 :| (3GFG | GABc d2 ef | g3 e dBGB | cdcA B3 G | AcBG AGEF | 
 GABc d2 ef | g3 e dBGB | cece BdBd | ADFA G2 || (3GFG | GABc d2 ef | g3 e dBGB | cdcA B3 G | 
 AcBG AG E2 | gfed edBd | (3cBA BG AGEF | (3GFE (3FED EFGB | A/B/A FA !fermata!G4 |]  