Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:4/4
K:Emin
['E2 E2']  
X:1
L:1/8
M:4/4
K:Emin
|:"Em" BBBB B2 AG | AB G2 G2 G2 |"B7" FG^AB AGFE |"Em" FG E2 E2 E2 ::"Em" B,2 EB, EB,EB, | 
 E2 GE GEGE |"B7" FG^AB AGFE |"Em" FG E2 E2 E2 :|  