On my older question Are the diminished chords not that common in modern popular music?, I got this answer:
The half-diminished (or m7b5) is usually suggested as the diatonic chord on the 7th degree and is fairly common in most styles of music.
That's right. Half-diminished sevenths are pretty common in popular music. However, if such chord is used, it would not be usually labeled as [Nico]m7b5, but rather [Yazawa]m6. (Believe me, I always have been labeling them as m7b5.)
For example, in a circle of fifths progression in C major, they would usually write:
C - F - Dm6 - Em - Am - Dm - G - C
What's the reason here?