Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
Q:1/4=92
M:6/8
K:C
['eee ed^c d(BA-) AB^G A2 ^G- GAB', 'B/B/B/c/ ddc Bcc |1 B(BA) z cc']  
X:1
L:1/8
Q:1/4=92
M:6/8
K:C
|: eee ed^c | d(BA-) AB^G | A2 ^G- GAB |1 c(BA-) A2 z :|2 c(BA-) Acc |: cBA AB^G | 
 A(G/F/E) z B/B/B/c/ | ddc Bcc |1 B(BA) z cc :|2 (B{c}B)A- A3- | A z z z2 z ||  