Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/8
M:6/8
K:Edor
['EFE G2 A B2 A Bcd', 'e2 f gfe', 'e2 f gfe', 'fed edB =cBA |1 BGE E3 :|2']  
X:1
L:1/8
M:6/8
K:Edor
 EFE G2 A | B2 A Bcd | DED F2 G | ABA AFD | EFE G2 A | B2 A Bcd | edB dBA |1 BGE E2 D :|2 BGE E3 |: 
 e2 f gfe | fag fed | e2 f gfe | fdB B3 | e2 f gfe | fag fed | edB dBA |1 BGE E3 :|2 BGE E2 D |: 
"^variations" E3 G2 A | B2 A Bcd | DED F2 G | AdB AFD | E3 G2 A | B2 A Bcd | edB =cBA |1 
 BGE E2 D :|2 BGE E3 |: e2 f gfe | f/g/ag fed | e2 f gfe | fdB B3 | e2 f gfe | f/g/ag fed | 
 edB =cBA |1 BGE E3 :|2 BGE E2 D ||  