OOM: As in that other thread, there are things we disagree on… :), but this isn’t one of them. I LOVE Lindsey Stirling (violin is really cool- almost as cool as flute 🙂 ). Never heard of the others *takes out her after-sefirah list and jots them down*. I also love the Piano Guys- there’s this amazing clip of them playing a song from a particularly well known boy group (which I absolutely loathe) on the piano. It’s absolutely amazing. They do things with that piano you wouldn’t believe.
I like the idea of a capella (the voice is just as much of an instrument as a flute or violin), but then it needs to be a song with lyrics I like. With orchestral music, it doesn’t matter. I do listen to Maccabeats, though the autotuning can get annoying.