Confounding factors are 1. The curse of dimensionality when computong distance functions and 2. The cost function of a bad song. People get mad if they get t

Confounding factors are 1. The curse of dimensionality when computong distance functions and 2. The cost function of a bad song. People get mad if they get too many things they don't like. Notice Pandora immediately sends you back to the band that seeded a station upon any thunbs down.