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
Q:3/8=100
M:6/8
K:G
['gfg d2 B d3']  
X:1
L:1/8
Q:3/8=100
M:6/8
K:G
"G" gfg d2 B |"C" cde"G" d3 |"Am" cac"G" BgB |"D" Adc"G" BAG |"G" gfg d2 B |"C" cde"G" d3 | 
"D7" caf"G" gdB |"D7" cAF"G" G3 ::"G" BAB GAB |"D7" cBc ABc |"G" Bdc BAG |"D" FDE FGA | 
"G" BAB GAB |"D7" cAF DEC |"G" B,CD"C" EFG |1"D" AGF"G" G3 :|2"D7" ABc def |]  