Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
M:2/2
K:D
['A2 A2 DFAF DEFF', '[FA]2 [FA]2']  
X:1
L:1/8
M:2/2
K:D
 D2- | DEFE D2 FF | GABG A2 A2 | DFAF DEFF | AFEF D2 DF | DEFE D2 [FA]2 | G2 !slide![GB]2 A2 A2 | 
 DFAF DEFF | AFEF D4 || FG A2 de d2 | cc c2 E3 E | EFGA BdAG | F2 [FA]2 [FA]2 FE | 
 [FA]2 [FA]2 [Fd]2 [Fd]2 | cd c2 E4 | EFGA BdAF | GF E2 D2 ||  