Develop a musical composition by utilizing the given alphabetic notation and supplied motif.
X:1
L:1/8
M:2/2
K:Bb
['(B2 B)d', 'b2 gb fgdf edcB']  
X:1
L:1/8
M:2/2
K:Bb
 F | (B2 B)d cBGB | FBDB DCCA | (B2 B)d cB FD | Egfe dBB :| a | b2 gb fgdf | edcB cCB,E | 
 bfgb Bcdc | BGFE DB,B, g | b2 gb fgdf | edcB cCCE | DB,DF GEGB | AFGc dBB ||  