Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:2/4
K:Edor
['d>B G>B', 'g>e dB']  
X:1
L:1/8
M:2/4
K:Edor
 d>B G>B | dB cA | d>B G>B | AB e2 | d>B G>B | dB cA | B>A G>B | AB e2 :| B>B g>e | dB cA | 
 B>B g>e | dB e2 |1 B>B g>e | dB cA | B>A G>B | AB e2 :|2 e>f g>e | dB cA | B>A G>B | AB e2 |]  