Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:6/8
K:Emin
['efg dcB AGF', 'E2 F GBB B>AG FDF']  
X:1
L:1/8
M:6/8
K:Emin
 B | Bee efg | dcB AGF | Eee efg | f^df e2 E | Eee efg | dcB AGF | GAB B^cd | AGF E2 :| F | 
 GBB B>AG | FDF A>GF | GAB B^cd | AGF E2 F | GBB B>AG | FDF ABd | f>ed edB | A>GF E2 :|  