Compose a musical piece using the designated musical pattern's alphabetic representation and the assigned melodic theme.
X:1
L:1/8
M:2/4
K:D
['dc BcBAGdcB ABAG F2 BA']  
X:1
L:1/8
M:2/4
K:D
|: dc | BcBAGdcB | ABAG F2 BA | GAGFEFGE | B2 A2 A2 dc | BcBAGdcB | ABAG F2 BA | GAGFEGFE | 
 D2 D2 D4 :|  