A double whammy is two gigs on two consecutive nights. This time it was French metal band Gojira on the 13th March, followed by prog rock band Magenta on 14th March. Both were excellent.
Here's some Gojira for you.
And here's a bit of Magenta.
... it just has to sound plausible.


Here's one I like: it's Led Zeppelin's 'Kashmir' by a Czech band called Silent Stream of Godless Elegy. They play doom metal influenced by Moravian folk music and deserve a wider audience.
Survivor's 'Eye of the Tiger' by Withering, on the other hand, is not so good. A rock anthem with growl vocals just sounds, well, silly. I should point out that Withering, a death/doom metal band from Finland, are actually pretty good. They're not unlike Insomnium, a favourite band of mine. (I've seen Insomnium live twice, and they were excellent on both occasions.)