Who would've thought we'd see the day when a cappella groups were ruling the charts? America made its love for Pentatonix known by sending not one, but two of the quintet's albums to the Top 5 on the Billboard 200 this year. That's Christmas to Me just barely missed the top spot when it rose to No. 2 in early December, while the band's PTX Vol. III EP debuted at No. 5 in September.