Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:2/4
K:D
['dddA Bd A2', 'fdd faaa daa>f g>ef>d e>f e/d/c/A/ dABA']  
X:1
L:1/8
M:2/4
K:D
 A | dddA | Bd A2 | eede | fe e2 | dddA | Bd A2 | eede fdd :: faaa | daa>f | g>ef>d | 
 e>f e/d/c/A/ | dABA | dABA | e2 ed/e/ | fd d2 :|  