Thanks, Mornak -- I have also enjoyed Sophie Sugar for quite a while. She's been consistently solid in everything she releases. The only thing I've found that I really like from Yuri Kane is what I posted, but I've not looked extensively. The funny thing about Pentatonix is that I actually do not like a capella music as a general rule. The problem, in my mind, is that the human voice just has such limited range of sounds and tone compared to what you can get, say, with an ensemble of instruments. But Pentatonix has such amazing range and versatility that they prove me wrong -- at least partly. And it isn't just me that has taken notice. Their second album actually broke billboard's top ten -- that's just crazy for an a capella group. I've never heard of such a thing and would have bet anything it would never happen. Their European tour sold out every single venue, completely, and that Daft Punk video on YouTube has over 30 million views in less than 2 months. That's impressive, I think. The only thing that worries me is whether you can really keep going indefinitely with just voice, even if you're as good as they are. However, they have been willing to branch out a bit. They did a cover of Imagine Dragon's "Radioactive" with a violinist (Linsey Stirling) that is very good -- I like it better than the original simply due to its musical inventiveness, and I love the cello and violin elements -- they add a lot. In particular, take a listen to the section between 2:33 and 3:15 -- that section alone blows away anything in the original Imagine Dragons version... Sorry Imagine Dragons fans. I love string instruments anyway, and it turns out that Pentatonix' percussionist plays cello quite well. I would love to see them use that more. I figure if you couple that amazing voice talent with a bit of instrumentation, you can keep your sound fresh and interesting long term. Apocalyptica did it with rock + cellos, so there is some precedent (although that was in Helsinki, Finland). Still, I think Pentatonix has the potential to really shake up the music scene in the mainstream, and I really hope they do. For sure, I'm really tired of Clear Channel controlling so much of what people hear in the US.