That's a fantastic looking skin. Great work!
What is that format that your using to return data, its not JSON.
[{title_id: "128", track_id: "128", artist: [[1, 1, "admin", "http://www.sampatti.com/xtraxxdev2/admin"], [128, 1, "New jrAudio", "http://www.sampatti.com/xtraxxdev2/admin/songs/128/new-jraudio"], [3809, 2, "admin", "http://www.sampatti.com/xtraxxdev2/admin"]], title: "New jrAudio", title_url: "http://www.sampatti.com/xtraxxdev2/admin/songs/128/new-jraudio", track_url: "http://www.sampatti.com/xtraxxdev2/admin/songs/128/new-jraudio", label: [13088, "", "songs"], genre: "Accapella", genre_url: "/songs/genre=Accapella", catnumber: "SSR1301000", promo: false, duration: "00:00:01", r_date: "2014-05-22", price: {hbr: 10.00, wav: 10.00}, bought: false, bpm: 128, license: 175, image: "http://www.sampatti.com/xtraxxdev2/songs/image/audio_image/128/large/crop=auto/", thumb: "http://www.sampatti.com/xtraxxdev2/songs/image/audio_image/128/small/crop=auto/", mp3: "http://www.sampatti.com/xtraxxdev2/songs/stream/audio_file/128/key=q9uz9A3SRf9d/file.mp3", waveform: "http://www.sampatti.com/xtraxxdev2/songs/image/audio_waveform_image/128/xxlarge/"}]
When I open the file directly in firefox it plays just fine. So it seams to me to be something to do with the headers.
The same issue does not appear to be an issue with the default players so I would look at the way you are passing the song to the player.
In the default players it is passed in via the jPlayerPlaylist() javascript function.