Compose a musical piece in accordance with the outlined theme and structure.
X:1
L:1/8
M:4/4
K:G
['BGDC B,G,DC B,G,B,D ECEG', 'FDEF G2'  
X:1
L:1/8
M:4/4
K:G
|: BG G2 BGcG | BGDC B,G,DC | B,G,B,D ECEG | FDEF GBdc | BG G2 dGcG | BGDC B,G,DC | B,G,B,D ECEG |1 
 FDEF G2 GA :|2 FDEF G2 ga |: bg g2 efde | cdBc ABGA | FGEF DECD | B,CA,B, G,A,B,D | GB B2 GBdB | 
 c2 cB AFDC | B,G,B,D ECEG |1 FDEF G2 ga :|2 FDEF G2 GA ||  