Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
M:4/4
K:G
['D2 F4 FGAB', 'G2 z2 BA B2 cBce d2 B2']  
X:1
L:1/8
M:4/4
K:G
|: (3DEF | .G2 B2 BGBd | c2 D2 F4 | FGAB cdef | gb af gdBd | .B2 G2 GBdB | A2 D2 F4 | 
 FGAB (3cBA FA | .G2 GF G2 :: z2 | BA B2 cBce | d2 B2 B2 (3efg | agfe dcBA | .G2 g2 g2 gg | 
 g2 dB e2 cA | d2 BG E2 AG | FGAB (3cBA FA | .G2 GF G2 :|  