...this one brings together a selection of excellent things: A fantastic soloist, and excellent group, and a very good song.
Below are Pentatonix and Lindsey Stirling collaborating to cover Radioactive (originally by Imagine Dragons). Note that this is not the last time that Pentatonix, Lindsey Stirling or Radioactive covers will be featured in my lists.
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Lindsey Stirling is flat out awesome - a violinist that makes Vanessa Mae look more than a little bit pedestrian. Pentatonix are possibly even better - they are an acapella group where you are often genuinely pushed to notice that there aren't any other instruments (other than occasionally a cello). Radioactive is...pretty good, and imagined wonderfully in the video in a post-apocalyptic world, where someone clearly pressed the red button and it all went a little bit wrong.
Violin and cello seamlessly combine with voices, good video production and editing, and make a wonderful video that sounds amazing, looks fantastic and really showcases just how good these performers are. The five singers are individually excellent, and come together to harmonise beautifully. Lindsey moves like only a dancer can, adding extra dynamics to the performance before her violin even comes into play.
It's lots of really talented people working together. Listen, experience and enjoy.