Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:6/8
K:D
['FAA EAA F2 A', 'fAe dBA']  
X:1
L:1/8
M:6/8
K:D
|: FAA EAA | F2 A Bdd | FAA E2 A | BAF AFE | FAA EAA | F2 A BAF | AB/c/d add | fAe dBG :: ABd fed | 
 fAe dBA | F2 A E2 A | BAF AFE |1 AB/c/d f2 a | dee dBA | AB/c/d add | fAe dBA :|2 FAA EAA | 
 FAA Bdd- | d3- d2 A | BAF AFE ||  