Develop a musical piece employing the provided motif and an alphabet-based structure.
X:1
L:1/4
Q:1/8=300
M:4/4
K:C
['A G']  
X:1
L:1/4
Q:1/8=300
M:4/4
K:C
 e3 e/ | e/d/ c A G | g3 g/ | g/a/ b/g/ a g | e3 e/ | e/d/ c A G | g ^f/g/ a g | c3/2 c/ c2 | 
 C C/C/ E G | c c/c/ A G | B2 B B | B B A G | C C/C/ E G | c c/c/ A G | g ^f/g/ a g | c3/2 c/ c2 :|  