Apple has extended song previews to 90 seconds in some international iTunes music stores. As noted by MacRumors, the extended previews are available in Canada, Australia, New Zealand, the United Kingdom and some other parts of Europe. As with the US store, not all songs will have 90 second previews; some are still limited to 30 seconds.
When Apple first began offering 90 second song previews in the US back in December they apparently did so without consulting the music labels. Instead they simply added a new agreement to iTunes Connect that the labels had to accept to continue adding songs to iTunes. It read:
“We are pleased to let you know that we are preparing to increase the length of music previews from 30 seconds to 90 seconds on the iTunes Store in the United States. We believe that giving potential customers more time to listen to your music will lead to more purchases.”