an ayu 'encore'??

[walking proud]

i have A MUSEUM and this is the tracklist:

01. A Song for XX
02. Greatful days
03. evolution
04. poker face
05. Trust
06. Depend on you
07. YOU
08. Dearest
09. M
10. appears
11. vogue
12. NEVER EVER
13. SURREAL
14. Fly high
15. UNITE!
16. AUDIENCE
17. forgiveness

encore

18. SEASONS
19. No way to say
20. independent
21. Boys & Girls
22. Trauma
23. flower garden
24. Who...

what does the "Encore" part mean ??