Create a musical composition employing the given alphabetic structure and melodic theme.
X:1
L:1/8
Q:1/4=120
M:6/8
K:Bb
['F BFB dcB cAF']  
X:1
L:1/8
Q:1/4=120
M:6/8
K:Bb
 F | BFB dcB | cAF e3 | dcB (A/B/c)A | BFD B,2 F | BFB dcB | cAF cde | dcB FBA | B3- B2 |:  