Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
M:4/4
K:Bmin
['f (Bf){c}', '(FB)Bc{c} dBcA (EA)AB (cd)ec']  
X:1
L:1/8
M:4/4
K:Bmin
 g | f (Bf){c} dBfB | f^ga (ef) cAec | f (Bf){c} dBed | ec{^g}acB/B/B B :| A | (FB)Bc{c} dBcA | 
 (EA)AB (cd)ec | (FB)Bc{c} dBdb | afec B/B/B BA | (FB)Bc{c} dBcA | (EA)AB (cd)ec |{c} dBdb cAce | 
{c} dfec B/B/B B ||  