Craft a musical work adhering to the specified theme and structure.
X:1
L:1/8
M:4/4
K:G
['FGAB c2', 'fgaf dggf g3 a bgag'  
X:1
L:1/8
M:4/4
K:G
|: BGAF DGGA | B2 ge fdcA | BGAF DG G2 |1 FGAB c2 dc :|2 FGAB c2 Bc |: dggf g2 bg | dg g2 fgaf | 
 dggf g3 a | bgag fdcA :|  