Construct a musical work using the letter-based representation of the specified pattern and the given melodic subject.
X:1
L:1/8
M:2/2
K:Bb
['DE F B2', 'gf d2']  
X:1
L:1/8
M:2/2
K:Bb
 DE |:"Bb" F B2 c dcBc | d f2 g f3 g- |"Gm" g2 ga gf d2 |"F" c2 cd cB G2 |"Bb" F B2 c dcBc | 
 d f2 g f3 g- |"Gm" gfga gf d2 |1"F" cB A2"Bb" B2 DE :|2"F" cB A2"Bb" B2 ba |:"Gm" g2 ga gf d2 | 
"Bb" fdfg f2 df |"Gm" g2 ga ba g2 |"Bb" fe d2"F" c4 |"Bb" F B2 c dcBc |"Bb" d f2 g f3 g- | 
"Gm" gfga gf d2 |"F" cB A2"Bb" B4 :|  