Create a musical composition based on the alphabetic representation of the predetermined pattern and the given melodic theme.
X:1
L:1/8
M:3/4
K:C
['B2 (GB) dB', 'B2 A2 (FA) cA B2 (GB) dB']  
X:1
L:1/8
M:3/4
K:C
[K:G]"^2" d2 | e2 d2 c2 | B2 (GB) dB | A2 (FA) cA | B2 (GB) dB | e2 d2 c2 | B2 (GB) dB | 
 (cA) (ec) AF | G4 :: B2 | A2 (FA) cA | B2 (GB) dB | c2 (Ac) ec | d4 B2 | A2 (FA) cA | B2 (GB) dB | 
 (cA) (ec) AF | G4 :|  