Compose a piece of music following the specified structure and theme.
X:1
L:1/8
M:2/2
K:Bb
['B2 b2 fdcB', 'dBB B BAFD ECCc AFcF dFcF BGFD'  
X:1
L:1/8
M:2/2
K:Bb
 B | B2 b2 fdcB | AFcF dFcF | B2 b2 fdcB | FABc dBB :: B | BAFD ECCc | AFcF dFcF | BGFD ECCA | 
 FABc dBB :|  