Develop a musical composition incorporating the given motif while adhering to the outlined alphabetical form.
X:1
L:1/8
M:4/4
K:Bb
['(bg) fdcd BGFE D2 B,2 B,2 (BA)', 'B2 (FE) DFBc (3(ded) (3(cdc) BcAB G2']  
X:1
L:1/8
M:4/4
K:Bb
 (bg) | fdcd BGFE | D2 B,2 B,2 (BA) | GABc de=ef | gf=ef B2 (bg) | fdcd BGFE | D2 B,2 B,2 (BA) | 
 GBEg fece | d2 B2 B2 :: (FE) | DFBc (3(ded) (3(cdc) | BcAB G2 (gb) | bd=eg fAcd | de=ef c2 (fe) | 
 dbca BgAf | GeFd EcDB | GABc de=eg | f_ecd B2 :|  