Create a musical composition using the given alphabetical pattern and melodic theme.
X:1
L:1/8
M:2/4
K:Bb
['F B>cB>F B>cB>F B>cd>e f3 g f>gf>b', 'B3 g .b(agf) .g(gfe) .f(fed) e3 e']  
X:1
L:1/8
M:2/4
K:Bb
 F | B>cB>F | B>cB>F | B>cd>e | f3 g | f>gf>b | f>gf>b | fedc | B3 :: g | .b(agf) | .g(gfe) | 
 .f(fed) | e3 e | .f(fed) | .e(edc) | dcBA | B2 F2 | B>cB>F | B>cB>F | Bcde | f3 g | ffbb | ffdd | 
 BBFF | B,3 :|  