Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:4/4
K:Bmin
['f4 g/f/e/f/ gb f/e/d/e/ fb', 'ff e^d']  
X:1
L:1/8
M:4/4
K:Bmin
|:"Bm" FB BB |"F" ^AB c2 | FB ^AG |"Bm" F4 |"Bm" FB BB |"F" ^AB c2 | fe dc |"Bm" BF B z :| | 
"B7" bb bb |"Em" b/a/g/f/ e2 |"A7" aa gf |"D" f4 |"Em" g/f/e/f/ gb |"Bm" f/e/d/e/ fb | 
"F#7" ^a/b/a/g/ f/e/d/e/ |"Bm" f4 |"Em" g/f/e/f/ gb |"Bm" f/e/d/e/ fb |"F#7" c/d/e/g/ f/e/d/c/ | 
"Bm" BF B z || |"B" ^dd =cB | ff e^d |"Am" =c/^d/e/f/ e/d/c/B/ |"B" ^d4 |"B" ^dd =cB | ff e^d | 
"Am" A/B/=c/^d/ c/B/A/c/ |"B" B4 | |"B" ff e^d | aa gf |"Am" e/f/g/a/ g/f/e/^d/ |"B" f4 | 
"B" ff e^d | aa gf |"Am" =c/^d/e/g/ f/e/d/c/ |"B" BF B z |]  