Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
Q:1/4=100
M:3/4
K:G
['(de/f/) g4 bg a2 f2 d2 e4', 'D2 GBGB']  
X:1
L:1/8
Q:1/4=100
M:3/4
K:G
 (de/f/) | g4 bg | a2 f2 d2 | e4 ge | d2 B2 G2 | c4 ec | B4 dB | A2 G2 F2 | G4 :: z2 | D2 GBGB | 
 D2 AcAc | D2 GBGB | AGFE D2 | D2 GBGB | D2 AcBd | (ed/c/) B2"^tr" A2 | G4 :|  