Math-rock is a sound whose roots trace back to the American hardcore scene of the late-'80s.… Math-rock is, as its name suggests, renowned for its complexity. Where rock'n'roll is eternally stuck in 4/4 time, math-rock bands deliberately employed strange meters like 7/8 and 11/8. Bands flaunt virtuosity, not as individual players, but as a unit: stopping and starting at irregular intervals, turning on a dime and breaking in new, unexpected directions as one.