Hollly Cole for jazz, Freda Epstein for Folk, Best voice I feel belongs to the legendaryBarbara Streisand for what she can do with it. But for those who do not know Fredya and the Acoust Attitude on Red house records did an album called Midnight at Caball Hall and its some of the best acoustic...
An electrical diode, in general, allows current to flow in one direction only....apply the (+) voltage to one side; current flows freely - apply the (+) voltage to the other side; no current flows. There are a number of variations that behave a bit differently, but that is the basic function...