Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:4/4
K:G
['GEDE c3 e']  
X:1
L:1/8
M:4/4
K:G
 GEDE c3 e | d2 BG AE E2 | GEDE c3 e | deBG A2 GA :|  