Build a musical arrangement using the indicated alphabet-based system and the given motif.
X:1
L:1/4
M:4/4
K:C
['G G', 'z _B B A A G G']  
X:1
L:1/4
M:4/4
K:C
 C/D/E/F/ G G | c B/A/ G G | C/D/E/F/ G G | c2 G z :: _B B A A | G G F F | A3/2 B/ c A | G2 F z :|  