Produce a musical expression that follows the indicated alphabetical structure while integrating the provided thematic material.
X:1
L:1/8
Q:1/4=90
M:4/4
K:G
['GA B2', 'E2 B>c d3 e d2 cB g2']  
X:1
L:1/8
Q:1/4=90
M:4/4
K:G
 GA | B2 E2 B3 A | G2 F>E E2 DE | G3 A B>ABd | e2 A>B A2 GA | B2 (B/c/)d cBAG | A2 B2 g3 f | 
 e>ged B>ABd | e2 E>F E2 :: B>c | d3 e d2 cB | g2 d>e d2 gf | e3 f g>fga | b2 e>f e2 dc | 
 B2 g2 dBAG | A2 B2 g3 f | e>ged BAB^d | e2 E>F E2 :|  