Create a musical composition based on the alphabetic representation of the predetermined pattern and the given melodic theme.
X:1
L:1/16
Q:1/4=120
M:4/4
K:G
['DDDGB2A2 G2B2D3 z E3 z F2EF A2A2G3']  
X:1
L:1/16
Q:1/4=120
M:4/4
K:G
|: DDDGB2A2 G2B2D3 z | E3 z F2EF A2A2G3 z :|  