Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/8
M:4/4
K:G
['(g>ab)a (ged)B', 'BGDG B,GG,B']  
X:1
L:1/8
M:4/4
K:G
 d | (g>ab)a (ged)B | GBgb (aga)b | (g>ab)a (ged)B | cA (d/c/B/A/) BG G :| c | BGDG B,GG,B | 
 cedB cA-Ac | BGDG B,GG,B | cA (d/c/B/A/) BGGc | BGDG B,GG,B | cedB cA-Ac | Bdgb afgd | 
 ecAd BG-G |]  