Similarly, you’re not going to hear the difference in a car, where tonal quality is already murky, but you might if you’re wearing your noise-canceling headphones. For example, music with delicate timbres-a string quartet, say-might sound noticeably choppy at lower bitrates, whereas compressing an AC/DC song might not be so bad. CDs operate at 1,411 kbps, more than 10 times the rate of MP3s.) But a listener’s ability to distinguish sound quality depends on many factors, like age, hearing ability, and attentiveness, not to mention the style of music and where one listens to it. (The bitrate measures how much digital information gets transmitted every second. Studies ( PDF) have found that as long as you’re using high-quality encoding software, music compressed to a bitrate of 128 kbps or more is “transparent”-in other words, most listeners can’t distinguish it from CD quality. Will people be able to hear the difference? The luxury tracks will cost 30 cents more than the standard downloads. Record label EMI and Apple announced Monday that iTunes will soon offer premium music files, which come without copy protection and have a bitrate of 256 kbps instead of the usual 128 kbps.
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