Construct a music composition that complies with the designated structure and theme.
X:1
L:1/8
M:4/4
K:D
['af f2']  
X:1
L:1/8
M:4/4
K:D
 a3 b gf f2 | af f2 ed(3Bcd | e3 f g3 z | Begb ebg z | af f2 af f2 | a z f2 edBA | Fgaf gbed | 
 cAGE D2 z2 | af f2 af f2 | a z f2 ed(3Bcd | e3 f g3 B | egbe gbg z | af f2 af f2 | a z f2 edBA | 
 F2 AF GBed | cAGE D2 z2 ||  