Create a musical composition based on the alphabetic representation of the predetermined pattern and the given melodic theme.
X:1
L:1/8
M:4/4
K:G
['d2 dc', 'c2 cA']  
X:1
L:1/8
M:4/4
K:G
 Bc | d2 dc B2 ge | d2 dc BGBc | d2 dc B2 ge | d4 d2 :| B2 | c2 cA B2 BG | A2 AG FGAB | 
 c2 cA BGGB | A2 d2 G2 :|  