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
['BA A4']  
X:1
L:1/8
Q:1/4=90
M:4/4
K:G
"^Allegro" DE |"G" G2 G4 Bd |"Em" e2 e4 e>d |"C" dc c4 c>B |"G" B6 cB |"A" BA A4 BA | 
"Em" G2 G4 DE |"Am" BA A4 AG |1"G" G6 :|2 ||"G" G4"D7" d3/2e d/B |"Am" BA A4 AG :|  