Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/16
M:4/4
K:A
['c2A2 AcBA', 'fece agfe']  
X:1
L:1/16
M:4/4
K:A
 e2d2 | c2A2 AcBA | G2E2 E2>E2 | D2B2 BcBA | G2E2 E2ed | c2A2 AcBA | GABc defg | aece faed | 
 c2A2 A4 :| e2 | fece agfe | f2c2 c2>e2 | fece agfe | d2B2 B2>e2 | fece agfe | fefg agfe | 
 dcBA Gfed | c2A2 A4 :|  