Craft a musical piece that integrates the provided melodic theme and the corresponding alphabetical pattern.
X:1
L:1/8
M:4/4
K:Dmix
['FG ABAF DEFG AG(3FED c2 (3AB^c dcde', 'D2 de f2 fd ecAF Gggf g2']  
X:1
L:1/8
M:4/4
K:Dmix
 FG | ABAF DEFG | AG(3FED c2 (3AB^c | dcde fdAF | G2 GF G2 FG | ABAF DEFG | AG(3FED c2 (3AB^c | 
 dcde fdAG | F2 D2 D2 :| de | f2 fd ecAF | Gggf g2 fg | a2 ab agec | dcAF G2 FG | ABAF DEFG | 
 AG(3FED c2 (3AB^c | dcde fdAG | F2 D2 D2 :|  