Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
Q:1/8=160
M:6/8
K:G
['GBA G2 B', 'efe edB def gfg efe']  
X:1
L:1/8
Q:1/8=160
M:6/8
K:G
 (3D/E/F/ | GBA G2 B | def gdB | GBA G2 B | AFD AFD | GBA G2 B | def gfg | efe dBA | BGG G2 :| 
 B/d/ | efe edB | def gfg | efe edc | dBA ABd | efe edB | def gfg | efe dBA | BGG G2 :|  