Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
Q:3/8=120
M:6/8
K:G
['B cBc A2 c BAB', 'GEG AFD']  
X:1
L:1/8
Q:3/8=120
M:6/8
K:G
 B |:"Am" cBc A2 c |"G" BAB G2 B |"D" AFA"G" GEG |"D" AFD D2 B |1"Am" cBc A2 c |"G" BAB G2 B | 
"D" AFA"G" GEG |"D" AFD D2 B :|2"Am" cBc"C" EGc |"G" BAB"G" DGB |"D" AFA"G" GEG |"D" AFD D3 || 
"G" GBA"D" FAG |"A" EGF"D" D3 |"D" AFA"G" GEG |"D" AFD D3 |"G" GBA"D" FAG |"A" EGF"D" D3 | 
"G" BAF"A" AGE |"D" D3 D3 :|"A" ge^c cBc |"D" afd d^cd |"G" baf"A" ag^c |"A" e2 d"D" d^cd | 
"A" ge^c cBc |"D" afd d2 d |"G" baf"A" ge^c |"D" d3- d3 :|  