Generate harmonious tunes by incorporating the specified letter-based framework and the presented motif.
X:1
L:1/8
M:3/4
K:Bb
['g4 fd']  
X:1
L:1/8
M:3/4
K:Bb
|: B2 c2 |"Bb" d3 c B2 |"Eb" g4 fd |"Bb" f4- fg |"Bb" f4 Bc |"Gm" d4 cB |"Eb" g4 fd |"Cm" c4- cd | 
"F" c4 df |"Gm" d3 c B2 |"Eb" g4 fd |"Bb" f4 B2 |"Eb" b4 g2 |"Bb" f4 Bd |"F" c4 B2 |"Bb" B6- | 
"Bb" B2 :: d2 f2 |"Eb" g4 eg |"Eb" b4 ag |"Bb" f4- fg |"Bb" f4 df |"Gm" g4 fd |"Gm" f4 Bd | 
"Cm" c4- cd |"F" c4 df |"Gm" g4 eg |"Eb" b4 ag |1"Bb" f4 ed |"Eb" b4 e2 |"Bb" d4 Bd |"F" c4 B2 | 
"Bb" B6- |"Bb" B2 :|2"Bb" f4 B2 |"Eb" b4 g2 |"Bb" f4 Bd |"F" c4 B2 |"Bb" B6- |"Bb" B2 |]  