Mem Nahadr (/nəˈhɑːd/ nə-HAHD), also known as M. Nahadr and simply "M", is an American performance artist and multi-octave vocalist having access to the whistle register and best known for the performance of the song "Butterfly", composed by Yoko Kanno and lyricized by Chris Mosdell for Cowboy Bebop. She is co-produced by Grammy Award Winner, James P. Nichols. She is also an author, composer, poet, filmmaker, and human rights activist.