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:D
['Ad cB AF DE/F/ GE', 'Ad fa ge ed c/B/A']  
X:1
L:1/8
M:2/4
K:D
 Ad cB | AF DE/F/ | GE BA/G/ | FA D2 | Ad cB | AF DE/F/ | GE BA | D2 D2 :| Ad fa | ge ed | 
 c/B/A Bc | ed cB | Ad fa | ge ed | c/B/A GE | D2 D2 :|  