The FLAC (Free Lossless Audio Codec) format ensures that the audio files are of high quality, with no loss of data during compression. This results in a more accurate representation of the original recording, making it ideal for audiophiles. The 2013 torrent suggests that the files are encoded at a high bitrate, likely 16-bit or 24-bit, with a sample rate of 44.1 kHz or 48 kHz.