Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
M:4/4
K:Bb
['DF d>c BG F2 DF dB A>c', 'dB dB', 'A>c FA']  
X:1
L:1/8
M:4/4
K:Bb
"^A""^frei im Rhythmus" DF | d>c BG | F2 DF dB | A>c FA E2 | e>d cB | AF dc | B2 DG | F4 DF | 
 d>c BG | F2 DF dB | A>c FA E2 | e>d cB | AF dc | (B4 | B2) ||[M:4/4]"^B" B>G GE Gg fe | dB dB dB | 
 A>G Fg fe | d>B BG FB A_A | B>G GE Gg fe | dB dB dB | A>G Fg fe | d6 || 
[M:4/4]"^C""^sehr langsam" FF | f2 e2 d2 c2 | B>d FB DF dB | A>c FA E4 | A>c FA EF dc | 
 B>d FB D2 FF | f2 e2 d2 c2 | B>d FB DF dB | A>c FA E4 | A>c FA EF dA | B8 |]  