Produce a musical expression that follows the indicated alphabetical structure while integrating the provided thematic material.
X:1
L:1/8
M:2/2
K:Bb
['DBFB DdcB cCCB', 'fBdB fBdB']  
X:1
L:1/8
M:2/2
K:Bb
 uB | vFBEB DBFB | DdcB cCCB | FBEB DBFB | DdcA BB,B,B | FBEB DBFB | DdcB cCCB | DBFB EBDB | 
 FBcA BB,B, |] uB | vfBdB fBdB | cF"^4"AF cF"^4"AF | fBdB fBdB | FdcA BB,B,B | fBdB fBdB | 
 cF"^4"AF cF"^4"AF | fBgB aBbB | dBcA BB,B, |]  