Create a musical composition based on the alphabetic representation of the predetermined pattern and the given melodic theme.
X:1
L:1/16
M:2/4
K:D
['dcB2 g2f2 e2A2', 'a2fg a2fg agf2 e4 e2a2 gfe2']  
X:1
L:1/16
M:2/4
K:D
|: Bc | dcB2 g2f2 | e2A2 A2>B2 | cBA2 f2e2 | e2d2 B2>c2 | dcB2 g2f2 | e2A2 A2>G2 | FGAB cdef | 
 g4- g2 ::[K:D] fg | a2fg a2fg | agf2 e4 | e2a2 gfe2 | dcde fefg | a2fg a2fg | agf2 e4 | 
 e2a2 gfe2 | d4- d2 :|  