Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
M:4/4
K:C
['C>EG>A c<GA>a g>eg<e', 'g<ce>c g>cf>a']  
X:1
L:1/8
M:4/4
K:C
 C>EG>A c<GA>a | g>eg<e d2 d<e | C>EG>A c<GA>a | g>eg<e c2 c<e | C>EG>A c<GA>a | g>eg<e d2 d<e | 
 C>EG>A c<GA>a | g>eg<e c2 (3cef || g<ce>c g>cf>a | g>eg<e d2 (3def | g<ce>c g>cf>a | 
 g<ce>d c2 (3cef | g<ce>c g>cf>a | g>eg<e d2 d<e | C>EG>A c<GA>a | g>eg<e c2 c<e ||  