Produce a musical work that intertwines the supplied melodic theme and the indicated alphabetical pattern.
X:1
L:1/16
M:2/4
K:G
['GFGA BGdB AGAB', 'gfed cBAB cdef |1,3 gfga gfed e2a2']  
X:1
L:1/16
M:2/4
K:G
 (3(DEF) | GFGA BGdB | AGAB |1,3 cAFA | GFGA BGdB | AGAB A2 :|2,4 Agfa | gdec dBcA | B2G2 G2 :: 
 (3(def) | gfga gfed | cBAB cdef |1,3 gfga gfed | e2a2 a2 :|2,4 gdec dBcA | B2G2 G2 :|  