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WikiPedia: Pentatonix (album) http://www.allmusic.com/album/pentatonix-mw0002878... http://www.billboard.com/articles/columns/chart-be... http://www.billboard.com/charts/year-end/2015/top-... http://www.billboard.com/charts/year-end/2016/top-... http://boldandsugar.com/bold-sugar-interviews-mitc... http://swisscharts.com/showitem.asp?interpret=Pent... http://www.target.com/p/pentatonix-pentatonix-delu... http://musicline.de/de/chartverfolgung_summary/art... http://www.5music.com.tw/CDTop.asp?top=6 https://austriancharts.at/showitem.asp?interpret=P...