You can also try searching for Sukhi Sivam's Mahabharatham speech on YouTube. Many speeches and sermons are uploaded to YouTube, and you may be able to find the one you're looking for. You can then download the audio using a YouTube-to-MP3 converter.
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You can try visiting Sukhi Sivam's official website to see if they have made their Mahabharatham speech audio available for download. You can search for the website by typing "Sukhi Sivam official website" in a search engine.