That's right: Just 4 cellos & Drums - pretty freakin' sweet - and they all smiled a lot during the show too - they were having a fantastic time playing : I'd love to hang out with such talented people, wicked show,really worth going alone, as soon as they started I was really happy I went.
Oh - here I found a live show, wow they're hot. Anyhow - here they're performing at a world competition w/awesome dancers, trapeze artists, fire jugglers, the whole thing. Nice.
bit about them/outtake from Wiki page on the band:
Apocalyptica is a Finnish cello metal band, composed of classically trained cellists and, since 2005, a drummer. Three of the cellists are graduates of the Sibelius Academy in Helsinki, Finland. Their music features elements from cello metal, neo-classical metal, thrash metal, progressive metal and symphonic metal.