Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:4/4
K:Bmin
['', 'f2 Bb fBde', 'eAce fBdB fBde', 'eAce fBdB fBde fBdB eAce fBbB aB^gB']  
X:1
L:1/8
M:4/4
K:Bmin
 g |: f2 Bb fBde | f2 Ba eAce | f2 Bb fBde | f^gaf eAce :: fBdB fBde | fBdB eAce | fBdB fBde | 
 f^gaf eAce :: fBdB fBde | fBdB eAce | fBbB aB^gB | f^gaf eAce :|  