Half-diminished seventh chord topic

In music theory, the half-diminished seventh chord (also known as a minor seventh flat five) is created by taking the root, minor third, diminished fifth and minor seventh (1, ♭3, ♭5 and ♭7) of any major scale; for example, C half-diminished would be (C E♭ G♭ B♭). In diatonic harmony, the half-diminished chord naturally occurs on the 7th scale tone (for example, Bm7(♭5) in C major). By the same virtue, it also occurs on the second degree of natural minor (e.g. Dm7 (♭5) in C minor). Half... full article at wikipedia