The present invention relates to a system for creating musical content using a client terminal, and more specifically relates to a system for creating musical content using a client terminal, wherein diverse musical information such as a desired lyric and musical scale, duration and singing technique is input from an online or cloud computer, an embedded terminal or other such client terminal by means of technology for generating musical vocal content by using computer speech synthesis technology, and then speech in which cadence is expressed in accordance with the musical scale is synthesized as speech run by being produced for the applicable duration and is transmitted to the client terminal.