Develop a musical composition that includes the supplied motif while following the designated alphabetical pattern.
X:1
L:1/8
M:6/8
K:Bb
['F3 B3']  
X:1
L:1/8
M:6/8
K:Bb
"Bb" d3 ded |"F" c3 c3 |"Gm" B3 BcB |"D" A6 |"Eb" G3 GAB |"Bb" F3 B3 |"F" c3 cBc |"Bb" d3 z3 | 
 d3 ded |"F" c3 c3 |"Gm" B3 BcB |"D" A6 |"Eb" G3 GAB |"Bb" F3 B3 |"Bb/F" d3"F7" cBc |"Bb" B3 z3 || 
"Bb" F2 F FGF | F3 B3 |"F" c2 c cBc |"Bb" d3 B3 |"Eb" B2 B BAG |"Bb" F3 B3 |"Bb/F" d2 d"F7" cBc | 
"Bb" B6 |]  