Compose a musical piece using the specified sequence's alphabetical representation and the provided motif.
X:1
L:1/4
M:4/4
K:C
['A G (E/G/)']  
X:1
L:1/4
M:4/4
K:C
 (3G3 .G3 .A3 .G3 .A3 .B3 | .c A G (E/G/) | c A G (E/G/) | c A G (E/G/) | F E D | G,/ G,/ | 
 C3/2 D/ E C | F G A (A/B/) | c G/F/ E/F/ G/F/ | E D C ||  