Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:4/4
K:F
['cB A2 F2 C2 F2', 'B2 cB A2 F2 C2 F2']  
X:1
L:1/8
M:4/4
K:F
"^Part A2 B2""A" cB | A2 F2 C2 F2 | EFGA B2 cB | A2 F2 C2 F2 | EFGE F4 ||"B" A3 B c2 F2 | 
 A2 B2 B c2 A2 | d3 c B2 A2 | G2 A2 B2 cB | A2 F2 C2 F2 | EFGA B2 cB | A2 F2 C2 F2 | EFGE F4 ||  