I can't say that I was so hipster that I liked Pentatonix when they were on The Sing Off, because I never watched The Sing Off. I did learn about Pentatonix when they covered Radioactive with Lindsey Sterling (a song that we'll get to on the blog eventually). Of course, I started following them from there.
They've been combining original songs with covering other peoples' tunes as well. Occasionally they aren't as good as the original, and sometimes they do better.
In this case, Pentatonix covered Cosmo Sheldrake's Come Along, and I like it a lot better. It's more cheerful and playful a song than Cosmo's flatter range can provide. If you don't recognize his song, it was used in an Apple commercial.
Amazon Associates Links for Come Along (digital only): MP3