Craft a musical piece that integrates the provided melodic theme and the corresponding alphabetical pattern.
X:1
L:1/8
M:6/8
K:G
['efg dBG', 'GBd dBd']  
X:1
L:1/8
M:6/8
K:G
 B |{a} gfg efg | dBG G2 b | a^ga efg | afd def | gdg ba^g | ada c'ba | bag efg | dBG G2 :: B | 
 GBd dBd | e3 efg | GBd dBG | FGA AFD | GBd dBd | efg abc' | bag efg | dBG G2 :|  