Compose a piece of music following the specified structure and theme.
X:1
L:1/8
M:4/4
K:Amix
['', 'B/c/d e2 E2 A2 GB A2 B/c/d'  
X:1
L:1/8
M:4/4
K:Amix
 B/c/d |: e2 E2 A2 GB | A2 B/c/d ed B/c/d | agec d2 ed | BAGB d2 B/c/d :|  