Produce a musical expression that follows the indicated alphabetical structure while integrating the provided thematic material.
X:1
L:1/8
Q:1/4=140
M:2/4
K:G
['G2 BG B d2 g ec AG', 'G,2 ga bg fa df ef ge']  
X:1
L:1/8
Q:1/4=140
M:2/4
K:G
 G2 BG | B d2 g | ec AG | FA DC | B,D GD | EG ce | dB AF | G2 G,2 :| ga bg | fa df | ef ge | 
 dg dB | cd ec | B d2 g | ec AG |!D.C.! GF ED |]  