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A Buddhist chant...wusaa
Of course you can, try it
This site has chant rooms including real audio and will be adding more http://www.dzogchen.org/chant/index.htm
Yes Buddhists sing. Their form of singing is called a Buddhist chant and it is a form of incantation.
If you mean "Nam-myoho-renge-kyo," that is a Buddhist chant.