Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:4/4
K:A
['agae agae']  
X:1
L:1/8
M:4/4
K:A
 fg |"A" agae agae |"A" agae fedc |"Bm" dfBf dfBf |"E" dfag fece |"A" agae agae |"A" agae fedc | 
"Bm" dfed"A" dBAF |"E" EAGB"A" A2 :: ed |"A" ceAe ceAe |"A" ceAe fedc |"Bm" dfBf dfBf | 
"Bm" dfBf"E" gfed |"A" ceAe ceAe |"A" ceAe fedc |"Bm" dfed"A" dBAF |"E" EAGB"A" A2 :|  