Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:7/8
K:Emin
['DE ED', 'dc def', 'def g2 fe dec d2 cd-']  
X:1
L:1/8
M:7/8
K:Emin
|: AB de cBG | DE ED EFG | A z GF EFD | DE ED FGA | AB de cBG | DE ED EFG | A z GF EFD |1 
 DE ED E2 z :|2 DE ED EEF |:[K:G] G2 d z dcB | DE d z dcB | GA AA AGA | B2 de cBA | G2 d z dcB | 
 DE d z dcB | DE ED FFD |1 GG GG GGD :|2 GG GA AAA |:[K:F] B2 dc def | ee dc def | g2 fe dec | 
 d2 df edc | B2 dc def | ee dc def | g2 fe dec | d2 cd- d3 :|  