Develop a musical composition incorporating the given motif while adhering to the outlined alphabetical form.
X:1
L:1/8
M:3/4
K:Bb
['B2 BBBB B2 b4 B2 (3dcB (3dcB', 'd2 c2']  
X:1
L:1/8
M:3/4
K:Bb
 B2 BBBB | B2 b4 | B2 (3dcB (3dcB | Bdfa b2 | g2 f2 e2 | d2 e2 f2 | gfedcB | A2 GA F2 | B2 BBBB | 
 B2 b4 | B2 (3dcB (3dcB | Bdfa b2 | g2 f2 e2 | d2 e2 f2 | gfedcB | A2 GA F2 gB Tc4 | B6 :: 
 c2 fedc | d4 c2 | BABdcB | A4 G2 | F2 FFFF | F2 f4 | F2 (3AGF (3AGF | FA ce f2 | d2 c2 B2 | 
 A3 B c2 | dB A2 G2 |{G} F6 | B2 dcBA | GB edcB | Ac fedc | Td4 c2 | B2 BBBB | B2 b4 | 
 B2 (3dcB (3dcB | Bdfa b2 | g2 f2 e2 | d2 e2 f2 | ge d2 c2 | B6 :|  