Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
Q:1/2=90
M:2/2
K:G
['gfgb agfe d^cde d=cBA GBdB', 'B AGFG ABcA BAGA BcdB ecdB cABG']  
X:1
L:1/8
Q:1/2=90
M:2/2
K:G
 d/f/ | gfgb agfe | d^cde d=cBA | GBdB GBdB | c2 A2 A3 e | gfgb agfe | d^cde d=cBA | GBdB ecAF | 
 G2 G2 G3 :: B | AGFG ABcA | BAGA BcdB | ecdB cABG | AGFG A3 B | AGFG ABcA | BAGA BcdB | 
 ecdB cABG | AGFE D3 :|  