Create a musical composition based on the alphabetic representation of the predetermined pattern and the given melodic theme.
X:1
L:1/8
M:2/4
K:G
['B G2', 'd B']  
X:1
L:1/8
M:2/4
K:G
 d | B G2 A | B3 c | dgdB | ceAc | B G2 d | Bgbg | fd Te2 | d3 :: d | dBdB | ceAc | BdGB | AFED | 
 dBdB | ec Tc2 | fdef | g3 d | B G2 A | B3 c | dgdB | ceAc | B G2 d | B g2 e | dBcA | G3 :|  