Develop a musical composition that aligns with the given structural outline and thematic content.
X:1
L:1/8
M:2/4
K:G
['D GGGG']  
X:1
L:1/8
M:2/4
K:G
"_Lively" D | GGGG | B3 D | GGGG | B3 D | GGGG | B2 (BG) | FEFG | A3 D | FEFG | AAAD | F2 G2 | 
 A4 |1 D2 DD | E2 F2 | G4- | G3 :|2 d2 dd | e2 f2 | g4- | g3 |]  