Utilize the alphabetic system of the specified musical pattern and the supplied melodic theme to create a piece of music.
X:1
L:1/8
M:6/8
K:Bb
['d2 d']  
X:1
L:1/8
M:6/8
K:Bb
 F | F2 FFGA | B3 G2 G | G2 GBAG | F2 B D2 F | F2 EC>AA | B2 d d2 d | c2 ce>dc | B4 z B | 
 B2 B d2 d | f2 f d2 d | c2 cedc | BdcBAG | F2 B B2 d | f2 f d2 d | c2 cedc | B3- B2 |]  