Patent ID: 7786369

Claim:
A system for playing music, the system comprising: a determiner determining a type of a music file; a music file processor processing audio data of the music file depending on the type of the music file; a mood categorizer categorizing a mood of the processed music file; and a similar music search module searching for similar music having a mood similar to music which a user desires by referring to the categorized mood, wherein the determiner determines whether the music file corresponds to either a compressed file or a non-modified discrete cosine transform (non-MDCT)-based music file, wherein the music file processor comprises: a first decoder partially decoding audio data of the compressed file when the music file corresponds to the compressed file; a second decoder fully decoding audio data of the non-MDCT-based music file when the music file corresponds to the non-MDCT-based music file; a resampler resampling the audio data decoded in the second decoder; and a fast Fourier transform (FFT) module performing FFT on the resampled audio data.