Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:6/8
K:Amin
['EAA ABc dBG GBd cdc B2 A', 'E3 Eee e3 dBG Bcd Bee e2']  
X:1
L:1/8
M:6/8
K:Amin
 EAA ABc | dBG GBd | cdc B2 A | BGE E2 E | EAA ABc | dBG GBd | cdc B2 A | BGE E3 || Eee e3 | 
 dBG Bcd | Bee e2 B/c/ | dBc d3 | Bee efg | dBG GBd | cdc B2 A | BGE E3 ||  