which plugin do I need to hear audio on

[Abhishek Dixit]

I am using Ubuntu 12.04 64 bit Chrome Version 24.0.1312.52 on
following page http://swargarohan.org/ramcharitmanas/bal-kand/

there are audios

Ramcharitmanas - Bal Kand : Mukesh
Ramcharitmanas - Bal Kand : Anup Jalota
I have flash installed and vlc etc but upon hitting the above site the
audios do not play and some missing plugin kind of screen is
displayed.Which plugin in required here?

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Abhi