Formulate a musical piece by utilizing the specified motif and alphabet-based structure.
X:1
L:1/8
M:2/2
K:C
['cG A2 c6', 'ag _ba-ag-']  
X:1
L:1/8
M:2/2
K:C
 (_E2 | =E2) E2 EDEF | G2 ^F2 G2 AG | ^F2 D2 DE F2 | d8 | (B_B A2 G4) | !slide!B2 BA G4 |1 
 c2 Bc- cG A2 | c6 :|2 c2 dc- cG A2 | c6 |: cd | e g3- g2 ag | _ba-ag- g2 d e2 | 
[M:3/2] c4 _b a2 g- g3 d e2 |[M:2/2] c6 GA | F2 c4 dc | (_b=b) !slide!b2- bdcA | c6 GA | 
 (B_B =B2) g4- |[M:3/2] g2 ag _ba-ag- gd e2 |[M:2/2] c6 :|  