Watching through a few of their AC/DC covers reminds me of the real appeal of AC/DC - simply some of the best riff based grooves in the history of rock. Nothing too pyrotechnic, just impeccable groove/funk. I don't even like AC/DC to the extent of owning any of their material. That said, the riffs in Back in Black are simply the archetype of heavy rock. Listening to them done by 2CELLOS highlights the underlayment that supported the in-your-face vocals. In that song alone exist about 4 or 5 different riffs upon which so much study can be conducted. They both go in front of and sit behind the groove, pushing and pulling the song. So many tidbits of 'wait for it ---------- and there' silence and payoff. Just killer.

'Back in Black' and 'Kashmir' by Led Zeppelin. If I ever lay down a riff based groove that matches even one of the several riffs in either of these songs, it will be a day worth celebrating. I never 'got' either of these songs when they were first released. Only in the last 5 years or so have they really grabbed my attention. I love how 2CELLOS can peel back cover of the vocals in these songs and reveal their underlying intensity.

Another one which is great is their take on Nirvana's "Smells Like Teen Spirit". In that one they reveal the beauty of the melody in the verses. It doesn't sound so pretty when Kurt Cobain sang it, but it is really quite a beautiful melody. The interval jumps in the melody in the verse, and actually in the chorus are quite nice.

Mac, I thank you for bringing these guys to our attention. With the millions of views that they have, somehow I've been under a rock I guess - never heard of them before.