http://www.youtube.com/watch?v=-2YPlfFnk0Q

It's obviously tonal but not as high pitched. I think it sounds more like Chinese dialects than say Vietnamese or Thai.

sounds hindi and tibetan mix

It does sound like Tibetan mixed with an Indian language. lol

sounds like tagalog

u know what it sorta does

Sounds like Tibetan and Akha.

that's because they r in the same linguist family thingy

Burmese tonal system is much simpler compared to those languages. It's more like relative pitch or stress between the syllables. It doesn't have rising and falling tones like in those 'true' tonal languages like Vietnamese, Cantonese or Thai.

Sounds like a mix of Mandarin, Hmong, Tagalog.

To me it sounds like a mixture of Indian (Hindi), Tibetan, Japanese (maybe because they are so polite?).

I also had the Japanese impression for a second, but thats probably cos for the reason you listed, that they are so polite, which makes us feel as if its Japanese

The script is somewhat very familiar to me because the Burmese/Cambodian/Thai and Laotian scripts derived from the South Indian Tamil Pallava Script of the 7th century... So I use a very similar script.

The language does not sound like Chinese at all.