Proceeding the era of tonality, in the first half of 20th crntury, composers looked for new alternative systems. One of the most important methods or alternatives in this process was developed in the Vienna Second School as the dodecaphonic or twelve-tone system. This article reviews this process and introduces a path to the young composers, a way that is not limited to the twelve-tone system, but can embody it as well: «composition based on pre-designed systems».