This disc features a collection of a cappella songs from the 15th through the 20th Century. The music was recorded in REAL HD-Audio at 96 kHz/24-bit PCM and is presented in MLP, PCM, DTS and Dolby Digital with video. Users can select from 3 different audio mixes: 5.1 "Stage", 5.1 "Audience" & 2.0 Channel Stereo. Double sided with a DVD-Audio on one side and a DVD-Video disc on the other. Bonus features include channel identification tones, a photo gallery, liner notes and musician bios.