The a cappella group Pentatonix (previously) sing a medley of familiar songs that span centuries. It’s heavy on music from the 20th century, of course, because we have a great archive of recorded songs since the phonograph was invented. There are more songs per decade in the 21st century, but the century is still young. Something tells me Pentatonix is gearing us up for new Christmas music, since that's what they've become most known for. -via Metafilter
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