Develop a musical composition using both the specified melodic theme and the alphabetical pattern naming.
X:1
L:1/8
M:2/4
K:G
['D>E GB', 'dB BA/B/ dB B>A GE']  
X:1
L:1/8
M:2/4
K:G
 D>E GB | D>E GB | AE ED/E/ | GE EG | D>E GB | D>E GB | AE FG | AG G2 :| dB BA/B/ | dB B>A | 
 GE ED/E/ | GD D2 | dB BA/B/ | dB B>A | GE FG | AG G2 :|  