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:3/4
K:G
['A3 FGB']  
X:1
L:1/8
M:3/4
K:G
 A3 FGB | dc A2 ec | A3 FGB | dc A2 ec | A3 FGE | DF G2 BG | A3 FGB | DF G2 D2 |]  