Create a musical composition based on the alphabetic representation of the predetermined pattern and the given melodic theme.
X:1
L:1/8
Q:1/4=120
M:2/2
K:G
['gagf ecec AFAF', 'dBGB AFAB']  
X:1
L:1/8
Q:1/4=120
M:2/2
K:G
"^Fast" ef |[M:3/2] gagf ecec AFAF |[M:2/2] DEFG AdBA |[M:3/2] GABc dedd Bdef | gagf ecec AFAF | 
[M:2/2] DEFG A2"^+" e2 | dcBA G2 :: z (A | B)GBG dBGA | BGBG dBGB | AFAB cBAF | 
[M:3/2] DFAF GABc ddBc |[M:2/2] dBG(A B)GBG | dBGB AFAB | (cB)AF D2"^+" e2 | dcBA G2 :|  