Develop a musical composition by utilizing the given alphabetic notation and supplied motif.
X:1
L:1/8
Q:3/8=80
M:6/8
K:Bb
['ddd dcB c3']  
X:1
L:1/8
Q:3/8=80
M:6/8
K:Bb
 ddd dcB | c3 B3 | ddd dcB | c3 c3 | ccc cBc | d3 d3 | ccc cBA | G3 G3 ||  