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:4/4
K:G
['GA BG E2 AG FD EF GG']  
X:1
L:1/8
M:4/4
K:G
 DD | GG FE | D2 d2 d2 | Bd DD | GG FE | D2 Dd dd | Bd cd | e2 Bc | d2 AB | cA GF | D2 GA BG | 
 E2 AG | FD EF | GG GA BG | E2 AG | FD EF | GG z2 ||  