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
['DD GG GG BB BB']  
X:1
L:1/8
M:4/4
K:G
 D2 | G2 GG B G2 G | E2 EE A3 D | D2 FF A2 c2 | (B2 G4) | DD | GG GG BB BB | E2 E2 A2 GG | 
 F2 D2 E2 F2 | G6 | z D | D2- D3/2 F/ A2- A3/2 c/ | B G2 D- D4 | z2 z z/ D/ D3/2 D/ c3/2 c/ | B6 | 
 DD | GG GG BB BB | B2 E2 A2 GG | FF FD EE FD | G6 ||  