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:D
['', 'B2 A', 'B2 A']  
X:1
L:1/8
M:6/8
K:D
 ABc |: d2 A FGA | B2 A ABc | dcd ede | g2 d def | gag fgf | efe d2 A | BAG FGA |1 B2 A ABc :|2 
 B2 A A3 |:[K:Amix] a3 fef | g2 f efg | a2 f d2 f | ecA A3 | a2 a fef | g2 f e2 A | BAG FGA |1 
 B2 A A3 :|2 B2 A ABc ||  