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
['d>ef g>Bd c2', 'd>ef g>Bd c2', 'B<dA f>aa f<af f>ed e2 A d>ef', 'c2 A']  
X:1
L:1/8
M:6/8
K:D
|: e | d2 A d>ef | g>Bd c2 A | f>ed d>ef | g>Bd c2 e | d2 A d>ef | g>Bd c2 A | a2 a g>ec | 
 e>dd d2 :: g | a>fA d>ef | g>Bd c2 A | a>fd d>ef | g>Bd c2 g |1 a>fA d>ef | g>Bd c2 A | 
 a2 a g>ec | e>dd d2 :|2 a>fd f<ad | B>eg c2 A | a2 a g>ec | e>dd d2 |: d>ef d<fA | B>de B<dA | 
 f>aa f<af | f>ed e2 A | d>ef d<fA | B>de B<dA | a2 a g>ec | e>dd d2 :: g | a>fd a>fd | g>Bd c2 A | 
 g>Bd a2 f | f>ed e2 g |1 a>fd a>fd | g>Bd c2 A | a2 a g>ec | e>dd d2 :|2 f>ef a2 a | B>eg c2 A | 
 a2 a g>ec | e>dd d2 ||  