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:Dmix
['', 'GF EGGF E2 GE Addc BAGF E2', 'df eccB c/d/c Gf dBBA B2 Bf']  
X:1
L:1/8
M:4/4
K:Dmix
[K:Cmix]|: GF | EGGF E2 GE | Addc BAGF | E2 GF ECGB | ABcd c2 :: df | eccB c/d/c Gf | dBBA B2 Bf | 
 cAA^G A2 Ac |1 BGGF G2 :|2 A/B/c dB c2 ||  