A method for generating a music playlist includes: classifying a plurality of songs into first songs and second songs, the first songs being sample songs with mood vectors, and the second songs being new songs with no mood vectors; comparing physical attributes of the first songs to physical attributes of each second song; determining which first song of the first songs has physical attributes most similar to the physical attributes of each second song; assigning the mood vector of the determined first song having the most similar physical attributes to each second song; and generating a music playlist containing songs, all with mood vectors, by combining the second songs with mood vectors assigned thereto and the first songs.