Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:3/4
K:Bb
['FA B3']  
X:1
L:1/8
M:3/4
K:Bb
 B>B c2 d2 | eg f3 c | B>B A2 G2 | FA B3 F | BB A2 F2 | Bd e3 c | BB A2 c2 | FA B3 F |]  