Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:9/8
K:Emin
['EFE FED G2', 'BGB AFA G2', 'gfe efe e2', 'eBB e2 f g2', 'eBe dBA G2 A']  
X:1
L:1/8
M:9/8
K:Emin
 EFE FED G2 F | EFE cBA BGE | EFE FED G2 (G/A/) | BAG FAG FED :: BGB AFA G2 D | GAB dfe dBA | 
 BGB AFA G2 A | BAG FAG FED :: gfe efe e2 (e/f/) | gfg efg afd | gfe efe e2 (g/a/) | bag fag fed :: 
 eBB e2 f g2 f | eBB efg afd | eBB e2 f g2 (g/a/) | bag fag fed :: eBe dBA G2 A | Bee dBA BGE | 
 eBe dBA G2 A | BAG FAG FED :|  