Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/4
Q:1/4=200
M:2/4
K:C
['C E/F/ G A G2 c B/A/', 'E C']  
X:1
L:1/4
Q:1/4=200
M:2/4
K:C
 C E/F/ | G A | G2 | c B/A/ | G E |1 F G :|2 G2 || G A/G/ | C D | E C | D/E/ F | E C | D D | 
 G A/G/ | C D | E C | D/E/ F | E D | C2 :|  