Construct a musical work using the letter-based representation of the specified pattern and the given melodic subject.
X:1
L:1/8
M:4/4
K:G
['G2 BG', 'g3 a']  
X:1
L:1/8
M:4/4
K:G
 D | G2 BG dGBG | ABcd (3efg dB | G2 BG DGBG | ABAG FDEF | G2 BG dGBG | ABcd efga | bgaf gedB | 
 GBAF G3 :| (3Bcd | g3 a gede | g2 bg ageg | a3 b agef | g2 bg egde | g3 a gede | g2 bg agef | 
 g3 a gedB | GBAF G3 :|  