Develop a musical composition based on the provided pattern of letters and incorporating the given motif within it.
X:1
L:1/8
M:2/2
K:Bb
['B>cd>e .f(BAB) g>Ba>B .b(BAB) G>BF>B E>BD>B', 'z2 .f(BAB) .g(BAB) g>fg>a b>ag>f b>ag>f e>dc>B']  
X:1
L:1/8
M:2/2
K:Bb
|: B>cd>e .f(BAB) | g>Ba>B .b(BAB) | G>BF>B E>BD>B | B>ec>A B>AG>F | B>cd>e .f(BAB) | 
 g>Ba>B .b(BAB) | G>BF>B E>BD>B | G>ec>A B2 z2 :: .f(BAB) .g(BAB) | g>fg>a b>ag>f | b>ag>f e>dc>B | 
 c>ec>A B>AG>F | B>cd>e .f(BAB) | g>Ba>B .b(BAB) | G>BF>B E>BD>B | G>ec>A B2 z2 :|  