Compose a piece using the specified musical pattern based on the alphabet and the provided melodic theme.
X:1
L:1/8
M:4/4
K:G
['G2 FG EGDE GFGA BcdB eB B2', 'Bdd^c d2 d=c Bd d2', 'BGGF G2']  
X:1
L:1/8
M:4/4
K:G
 G2 FG EGDE | GFGA BcdB | eB B2 dBAF | GBAG EDEF | G2 FG EGDE | GFGA BcdB | eB B2 dBAF | GBAF G4 :| 
 Bdd^c d2 d=c | Bd d2 efgd | Bdd^c dBGB | c2 AG FGAc | Bdd^c d2 d=c | Bd d2 efga | bgaf gfed | 
 cBAG FGAc :| BGGF G2 Ac | BG G2 Bdgd | BGGF G2 AB | c2 AG FGAc | BGGF G2 Ac | BG G2 Bdga | 
 bgaf gfed | cBAG FGAc :|  