Historic Native American flutes are generally tuned to a variation of the minor pentatonic scale (such as you would get playing the black keys on a piano), which gives the instrument its distinctive plaintive sound. Recently some makers have begun experimenting with different scales, giving players new melodic options. Also, modern flutes are generally tuned in concert keys (such as A or D) so that they can be easily played with other instruments. The root keys of modern Native American flutes span a range of about three and a half octaves, from C2 to A5.