Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:6/8
K:A
['(c/d/) e>AB GFE Tc>Bc', 'A2 (A/B/) c(cd) e(ef) |{a} =gec d2']  
X:1
L:1/8
M:6/8
K:A
 (c/d/) | e>AB GFE | Tc>Bc dcd | ede cAF | =G3- G3 (c/d/) | e>AB GFE | Tc>Bc eag | fde cAB | 
 A3 A2 || | (A/B/) | c(cd) e(ef) |{a} =gec d2 (c/d/) | eAB{d} cAF | =G3- G3 (c/d/) | eAB GFE | 
 Tc>Bc eag | fde cAB | A3 A2 ||  