Can't determine whether or not a song is worth purchasing by only listening to 30 seconds of it?According to CNN, iTunes will extend their 30 second preview to 90 seconds.
"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."