Produce a musical expression that follows the indicated alphabetical structure while integrating the provided thematic material.
X:1
L:1/8
M:4/4
K:D
['g3 g fedf efga gfed eBBB dBAF', 'GFED CDEF GABc dDDD ADFD EFGA BAGF']  
X:1
L:1/8
M:4/4
K:D
|: g3 g fedf | efga gfed | eBBB dBAF | GBAF GFED :: CDEF GABc | dDDD ADFD | EFGA BAGF | GBAFGFED :|  