Construct a musical composition utilizing the provided motif and conforming to the specified structure.
X:1
L:1/8
M:4/4
K:D
['AF F2', 'fa a2 fb b2'  
X:1
L:1/8
M:4/4
K:D
 AF F2 AFdB | AF F2 G3 B | AF F2 ABde | fdaf efdB | AF F2 AFdB | AF F2 G3 B | AF F2 ABde | 
 fdaf efde || fa a2 fb b2 | faab afed | fa a2 fb b2 | afdf efde | fa a2 fb b2 | faab afef | 
 dBAF ABde | fdaf efdB ||  