Develop a musical composition that includes the supplied motif while following the designated alphabetical pattern.
X:1
L:1/8
M:2/2
K:Bb
['BGdG BGGB']  
X:1
L:1/8
M:2/2
K:Bb
 GA |"Gm" BGdG BGGB |"F" AFcF AFFA |"Gm" BGdG BGGB |"F" AF (3(D=E^F)"Gm" G2 GA |"Gm" BGdG BGGB | 
"F" AFcF AFFA |"Gm" GBAc"^(Bb)" Bdce |"D" dg^fa"Gm" g2 |] ga |"Gm" bgaf gdd=e |"F" fdcB AGFD | 
"Gm" bgaf gddc |"D" dg^fa"Gm" g2 ga |"Gm" bgaf gdd=e |"F" fdcB AGFD |"Gm" GBAc"^(Bb)" Bdce | 
"D" dg^fa"Gm" g2 |]  