Produce a musical expression that follows the indicated alphabetical structure while integrating the provided thematic material.
X:1
L:1/8
M:12/8
K:C
['ECE GEG cGc efg', "C3 c'gf edc gdc BAG Ac'b abg"]  
X:1
L:1/8
M:12/8
K:C
|: ECE GEG cGc efg | fed cBc d3 G3 | ECE GEG cGc efg | afe dcB c3 C3 :: c'gf edc gdc BAG | 
 Ac'b abg ^fga d3 | g3 de=f e3 c'3 | bag ag^f g3 G3 | g2 g g=fe f2 f fed | efg agf edc BAG | 
 A3 fdc B3 gfe | dfe dcB c3 C3 :|  