Compose tunes based on the given letter-based musical structure and the supplied motif.
X:1
L:1/8
M:3/4
K:F
['c2 dc A3 F Ec cC EG', 'F2 z2']  
X:1
L:1/8
M:3/4
K:F
 c2 |:"F" dc A3 F |"C7" Ec cC EG |"_d" d"_c"c"_b" B3"_e" E |"F""_f" Fc AC FA | dc A3 F | 
"C7""_e" E"_c"c"_b" B"_c"C"_e" E"_g"G |"_d" d"_c"c"_b" B3"_e" E |1"F""_f" F2 z2 c2 :|2 
"F" F2 z2 CC |:"C7""_c" C2"_b" B2"_a" A"_g"G |"F""_f" FA FA C2 |"C7" EG EG C2 |"F" FA FA C2 | 
"C7""_c" C2"_b" B2"_a" A"_g"G |"F""_f" FA FA C2 |"C7" EG EG C2 |1"F" F2 z2 cc :|2"F" F2 z2 z2 |]  