Develop a musical composition by integrating the alphabetically represented musical pattern and the supplied melodic theme.
X:1
L:1/8
M:6/8
K:D
['e |]:', 'dcd e>de fef', 'def gfg']  
X:1
L:1/8
M:6/8
K:D
 e |]: Add dcd | e>de fef | gfg B>cd | e>cA GFG | Add dcd | e>de fef | Bgf edc |1 d3 dcB :|2 
 d3 d2 || f/g/ | afa ded | faf def | gfg Bcd | ecA Afg | afa ded | faf def | gfg ecA | d3 dfg | 
 afa ded | faf def | gfg Bcd | efd cBA | Add dcd | ede fef | Bgf edc | d3 d2 |]  