Compose a musical piece using the designated musical pattern's alphabetic representation and the assigned melodic theme.
X:1
L:1/8
M:6/8
K:D
['f2 d', 'd3 fga afd afd d2 a gab']  
X:1
L:1/8
M:6/8
K:D
|: a2 g f2 d | ege cAc | d3 dcB | cBe A2 a | f2 d faf | gbe cAc | d2 B ecA | d3 d3 :: fga afd | 
 afd d2 a | gab bge | bge e2 g | fga aba | d2 f afa | b2 e cAc | d3 d3 :|  