A few years ago, Apple extended song previews in iTunes from 30 seconds to 90 seconds, for tracks longer than two and a half minutes. The move pleased users, as it enabled them to listen to a large chunk of the song before purchasing it.
It appears, however, that Apple has recently changed its policy regarding music samples, reverting some track preview times back to 30 seconds. The change has been reported by several users, on both mobile and desktop versions of iTunes...