Compose a piece of music that follows the specified structure and incorporates the given theme.
X:1
L:1/8
M:3/4
K:Bb
['DE FG Fd cB BA', 'BA AC E2'  
X:1
L:1/8
M:3/4
K:Bb
 DE |:"Bb" FG Fd cB |"F7" BA AC E2 | BA AC E2 |"Bb" GF FB, D2 | FG Fd cB |"F7" BA AC E2 | 
 BA AF d>c |1"Bb" B2 z2 DE :|2"Bb" B2 z2 z2 |:"Cm" G"Eb"e dc BA |"Bb" GF F4 |"F7" F2 cF A2 | 
"Bb" F2 dF B2 |"Cm" G"Eb"e dc BA |"Bb" G"F"F F4 |"F7" AF cF AF |"Bb" B2 B4 :|  