In jazz, the ii is typically played as a minor 7th chord, and the I is typically played as a major 7th chord (though it can also be played as a major 6th chord). The ii7–V7–Imaj7 progression provides smooth voice leading between the thirds and sevenths of these chords; the third of one chord becomes the seventh of the next chord, and the seventh of one chord moves down a half-step to become the third of the next chord. For example, in the key of C, the standard jazz ii–V–I progression is Dm7–G7–Cmaj7, and the thirds and sevenths of these chords are F–C, B–F, E–B; inverted for smoother voice leading, these become F–C, F–B, E–B.