Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
M:4/4
K:Bb
['D3 C B,2 B2 B4 G2']  
X:1
L:1/8
M:4/4
K:Bb
 B,2 |"Bb" D3 C B,2 B2 |"Eb" B4 G2 G2 |"Bb" F3 D"C7" D2 C2 |"F" C6"F7" E2 |"Bb" D3 C B,2 B2 | 
"Eb" B4 G2 B2 |"Bb/F" F3 D"F7" C3 B, |"Bb" B,6 F2 | B3 c B2"Eb" G2 |"Bb" F4 D2 F2 | B3 A B2 D2 | 
"F" (D4 C2)"F7" E2 |"Bb" D3 C B,2 B2 |"Eb" B4 G2 B2 |"Bb/F" F3 D"F7" C3 B, |"Bb" B,6 |]  