Craft a musical piece that integrates the provided melodic theme and the corresponding alphabetical pattern.
X:1
L:1/8
Q:1/8=180
M:2/2
K:D
['G FAAF GBBG FAAF GFED FAAF GFGA', 'fdeg fdef gfed B2']  
X:1
L:1/8
Q:1/8=180
M:2/2
K:D
 G | FAAF GBBG | FAAF GFED | FAAF GFGA | BdAF D2 D :| g | fdeg fdef | gfed B2 Ag | fdeg fdeg | 
 faef d2 dg | fdeg fdef | gfed B2 A2 | FAFA GFGA | BdAF D2 D2 |]  