Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/4
M:3/4
K:C
['c z z', 'A c2 z :|2 E A G']  
X:1
L:1/4
M:3/4
K:C
"C" G E c |"G7" B3 | F D A |"C" G3 | E D E |"G7" F3/2 G/ G |1 F E F |"C" E3/2 C/ C :|2 G A B | 
"C" c z z |:"G7" B/d/ d3/2 c/ | B B A |"C" G2 c | E2 c |"G7" B2 d |1 F2 B |"C" c2 e | G3 :|2 
 G e3/2 d/ |"C" c3/2 c/ c | c z z |:[K:F]"F" C3 | C F3/2 A/ |"Bb" D3 | D G3/2 F/ |"C7" E z d |1 
 E c B |"F" c F A | c2 z :|2 E A G |"F" F3/2 F/ F | F z z |]  