Produce a musical expression that follows the indicated alphabetical structure while integrating the provided thematic material.
X:1
L:1/8
M:2/4
K:Eb
['g2 gb']  
X:1
L:1/8
M:2/4
K:Eb
 g/g/ | gggf/g/ | e/f/e/c/ c2 | B>ce/f/g | f4- | f2 g/f/g/b/ | b3 c | e2 c2 | g2 gb | b4 | 
 b2 z e/e/ | eecB/c/ | g2 gb | gg g2 | fec z | cee/f/g | fe c2 | cB B2 | B4 | G2 z |]  