Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:4/4
K:Edor
['E3 A', 'Beed ef g2 Beed edB/c/d']  
X:1
L:1/8
M:4/4
K:Edor
|: E3 F G E3 | A B3 AGED | EDEF GFGA | B3 B AGFD | E3 F G E3 | A B3 AGFD | E e3 B E3 | A B3 AGED :: 
 Beed ef g2 | Beed edB/c/d | Beed efge | a2 eg fedA | Beed ef g2 | Beed edB/c/d | a3 g fedA | 
 B3 B AGED :|  