Craft a musical piece that abides by the prescribed structural guidelines and the given theme.
X:1
L:1/8
M:4/4
K:Bdor
['f2 fa fece', 'eAce fBBA B2 ce', 'eAcA B2 bB aBgB |1 fgaf eAcA'  
X:1
L:1/8
M:4/4
K:Bdor
|: f2 fa fece | fefa eAce | f2 fa fece | fgaf eAce :: fBBA B2 ce | fB B2 eAce | fBBA B2 ce |1 
 fgaf eAce :|2 fgaf eAcA |: B2 bB aBgB | B2 af eAcA | B2 bB aBgB |1 fgaf eAcA :|2 fgaf eAce |]  