Create a musical composition adhering to the provided thematic and alphabetical guidelines.
X:1
L:1/8
Q:1/2=75
M:2/2
K:G
['d2 g2 edcB dgfg edcB', 'G2 Bc d2 de dBGB e2 ef']  
X:1
L:1/8
Q:1/2=75
M:2/2
K:G
 Bc | d2 g2 edcB | dgfg edcB | DGBG DGBG | DGBd cBAG | d2 g2 edcB | dgfg edcB | gfgd ec AF | 
 G2 G2 G2 :: Bc | d2 de dBGB | e2 ef e2 AB | cBcd cAFA | dgea g2 fe | dBdB ecec | fdfd g2 ga | 
 bgfg ec AF | G2 G2 G2 :|  