Develop a musical composition by utilizing the given alphabetic notation and supplied motif.
X:1
L:1/8
Q:1/2=70
M:4/4
K:Bb
['f2 b2 a2 b2 g>ed>e f2 B2', 'F4 cA f2 d2 c>f e>dc>B A>G']  
X:1
L:1/8
Q:1/2=70
M:4/4
K:Bb
 f2 b2 | a2 b2 g>ed>e | f2 B2 d>B g2 | f>dc>B A>B (B3/2A/4B/4) | c2 F2 f2 b2 | a2 b2 g>ed>e | 
 f2 B2 d>Bg>f | (3=efe f>B A2 G2 | F4 :: cA f2 | d2 c>f e>dc>B | A>G F2 fd b2 | g2 f>b a>gf>e | 
 d>cB>f g2 g2 | f>Bd>f e>Ac>e | d>cB>f g4 | (3fba (3gfe d2 c2 | B4 :|  