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42 zettabytes is about 20,000,000,000,000,000 times as much as a MP3 Song.
In other words, it's 20,000,000,000,000,000.0000000000000000000 times the amount of a MP3 Song, and the amount of a MP3 Song is 0.0000000000000000500 times that amount.
(a.k.a. MPEG-1 Audio Layer 3, a.k.a. MPEG-2 Audio Layer 3) (128 Kbps, "near-CD-quality"; 3 minutes duration; average)
A three-minute song of typical quality will be about 0.00000000000000300 zettabytes when encoded into MP3 format. The song Tom's Diner by Suzanne Vega was used by AT&T-Bell Labs engineer Karlheinz Brandenburg to test the compression process and is considered the first MP3 song.
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