7.1 surround sound

[3][4] The Blu-ray Disc and the HD DVD home video formats provide up to eight channels of lossless DTS-HD Master Audio, Dolby TrueHD or uncompressed LPCM audio at 96/48 kHz 24/16-bit, or lossy Dolby Digital Plus up to 48 kHz at 1024 kilobytes per second.

While some movies have been remixed to 7.1 audio tracks on Blu-ray Discs for home cinema,[5] the first discrete theatrical 7.1 soundtrack was Toy Story 3 in 2010,[6] followed by Step Up 3D.

[7] In 2011, additional movies were released with theatrical 7.1 audio, including Thor, Pirates of the Caribbean: On Stranger Tides, Kung Fu Panda 2, Super 8, Green Lantern, Cars 2, Transformers: Dark of the Moon, Captain America: The First Avenger.

[8] 7-1-surround-sound The history of electronic music includes the evolution of multi-channel playback in concert (arguably the real roots of "surround sound" for cinema) and for a considerable time the 8-channel format was a de facto standard.

This standardisation was fostered, in great measure, by the development of professional and semi-professional 8-track tape recorders—originally analog, but later manifesting in proprietary cassette formats by Alesis and Tascam.