Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
Q:3/8=50
M:3/8
K:Bb
['.f(f/g/)(f/e/) (fB).B .c.A.F .d.B.F .f(f/g/)(f/e/) .d.B.B .c.A.F', 'cAF ecA fdB .f(f/g/)(f/e/) dBB cAF']  
X:1
L:1/8
Q:3/8=50
M:3/8
K:Bb
 .f(f/g/)(f/e/) | (fB).B | .c.A.F | .d.B.F | .f(f/g/)(f/e/) | .d.B.B | .c.A.F |"^1/0" [DB]3 :: 
 cAF | dB"^1"F | ecA | fdB | .f(f/g/)(f/e/) | dBB | cAF | [DB]3 :|  