Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:9/8
K:A
['cBA cde', 'cde ece e3']  
X:1
L:1/8
M:9/8
K:A
|: vA2 vA cBA cde | uA2 uA cBA GFE | A2 A cBA cde | fga e2 d cBA :: cde ece e3 | cde ecA GFE | 
 cde ece e3 | fga e2 d cBA :|  