Compose a musical piece using the designated musical pattern's alphabetic representation and the assigned melodic theme.
X:1
L:1/8
M:4/4
K:G
['FDDE FGAG', 'D4 Addc AGFG FGAB c3 B Addc']  
X:1
L:1/8
M:4/4
K:G
|: FDDE FGAG | FDDB, C2 DE | FDDE FGAG | FDEF D4 :: Addc AGFG | FGAB c3 B | Addc ABAG | FDEF D4 :|  