Write a musical work incorporating the specified theme and letter-based framework.
X:1
L:1/8
M:4/4
K:G
['', 'BGGF GABc', 'g2 ag g2']  
X:1
L:1/8
M:4/4
K:G
 A |: BGGF GABc | dGAF GFDE | =F2 EG =FGAB | c=F =F2 C=FAc | BGGF GABc | dG G2 dGBG | Ad d2 Adeg |1 
 fdcA GFGA :|2 fdcA G2 Ac |: dggf g2 ga | bgaf gfde | =f2 cf fedc | c2 Bc ABcA | dg g2 ag g2 | 
 bg g2 ag g2 | Ad d2 Adeg |1 fdcA G2 Ac :|2 fdcA G3 ||  