Develop a musical composition that aligns with the given structural outline and thematic content.
X:1
L:1/8
M:4/4
K:D
['=cd- dd- dc']  
X:1
L:1/8
M:4/4
K:D
 =cd- dd- dc A2- | A2 f2 g2 f2 | =cd- dd- dc A2 | FG GF D2 D2 | =cd- dd- dc A2- | A2 f2 g2 f2 | 
 a2- ag- g2 f2 | g2- gf- f2 e2 |]  