Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:4/4
K:G
['dBGB d2 cB', 'egdg Bgdg']  
X:1
L:1/8
M:4/4
K:G
 (3(DEF) | G2 G2 G2 Bc | dBGB d2 cB | A2 A2 A2 gf | e3 d efge | (dc)({c}BA) (GA)(Bc) | dBGB d2 cB | 
 ABcd BcAB | G2 E2 E2 :: gf | egdg Bgdg | egdg Bgdg | eaca Aaca | eaca Aaca | egdg Bgdg | 
 efge edBG | ABcd BcAB | G2 E2 E2 :|  