Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/8
M:6/8
K:G
['gec cde', 'afa geg', 'dBG GAB', 'ece dBd']  
X:1
L:1/8
M:6/8
K:G
 gec cde | f2 e d2 c | gec cdc | [Gd]2 e f2 a | gec cde | [df]2 [ce] [Gd]2 c | ege fdg | ecc c2 :| 
 afa geg | afa geg | abc' gfe | [Gd]2 [ce] [df]2 a | gab c'ba | gfe d2 c | ege fdg | ecc [Cc]2 :| 
 dBG GAB | c2 B A2 G | dBG GAG | [DA]2 B c2 e | dBG GAB | [Ac]2 [GB] [DA]2 G | BdB cAd | BGG G2 :| 
 ece dBd | ece dBd | efg dcB | [DA]2 [GB] [Ac]2 e | def gfe | dcB A2 G | BdB cAd | BGG [G,G]2 :|  