Produce a musical arrangement that complies with the dictated structure and the suggested theme.
X:1
L:1/8
M:4/4
K:Bb
['BBB BG G2 z BAG GF F2']  
X:1
L:1/8
M:4/4
K:Bb
 DDE | F3 FdcBD | FE E3 EEE | c3 BAGFE | ED D3 BBB | BG G2 z BAG | GF F2 z BBd | c>de>cAAGA | 
 B4 z BBB | BG G2 z BAG | GF F2 z BBd | c>de>cAAGA | B4 z |]  