This is a very subjective task. Employees, friends and family members that get together for some wine and vote on each price range, for the earphones that sounded and fitted their best. Each reviewer may skip between any of the songs with each earphone model on a given price range group of models. They have to listen to at least one time each song with each model or until they feel comfortable before voting for their favorite model on each price range. This is how we do it.