Develop a musical composition that aligns with the given structural outline and thematic content.
X:1
L:1/8
M:4/4
K:D
['a2 gf dfed edBd ABde fdge fdef', 'B3 f edBd'  
X:1
L:1/8
M:4/4
K:D
|: a2 gf dfed | edBd ABde | fdge fdef | afed e2 fg | a2 gf dfed | edBd ABde | fdge fdef | 
 afef d4 :: B3 f edBd | ABGB dfed | B3 f edBd | Adgf e2 ed | B3 f edBd | ABGB ABde | fdge fdef | 
 afef d4 :|  