Craft a musical composition that adheres to the specified musical theme and letter-based structure.
X:1
L:1/8
Q:3/8=100
M:6/8
K:C
['ced cAG', 'ceg gec']  
X:1
L:1/8
Q:3/8=100
M:6/8
K:C
 c3 c3 | ced cAG | cAA A2 A | agf edc | c>dc c2 c | ced cAG | fgafed | cde{e} d2 c || ceg gec | 
 agf edc | ceg abc' | c>dc cAG | ceg gec | age edc | fga gc'c | cde{d} d2 c |]  