Utilize the alphabetic system of the specified musical pattern and the supplied melodic theme to create a piece of music.
X:1
L:1/4
Q:1/4=120
M:6/4
K:D
['B A G']  
X:1
L:1/4
Q:1/4=120
M:6/4
K:D
 B A G F3/2 E/ D | f e d e2 E | B A G F3/2 E/ D | f e d/c/ d2 D | B A G F3/2 E/ D | a g a e2 E | 
 B A G F3/2 E/ D | f e d/c/ d2 D | B A G A D2 | B A G c E2 | B A G (F G) A | B/c/d/c/d/e/ d2 D ||  