Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:2/4
K:A
['B c']  
X:1
L:1/8
M:2/4
K:A
 B2 B c | B2 F A | B3 c | B2 z2 | A2 A c | B2 A F | E3 C | E2 z2 | B c B A | B c B A | F2 F A | 
 D4 | F E F A | E F E D | B,3 A, | B,4 |]  