The Doobie Brothers' 1972 Album Toulouse Street: Quadio on Blu-Ray Audio Disc. Transferred from the Original Half-Inch Four-Channel Masters. Blu-Ray with 192/24 Resolution Quadraphonic & Hi-Res Stereo Mixes.

Quadraphonic sound, or 4.0 surround sound, utilizes four audio channels connected to four speakers positioned at the corners of a listening space. The multi-tracked audio is mixed dimensional, immersing the listener in an expansive soundscape.

Rock and Roll Hall of Fame® and Vocal Group Hall of Fame® inductees The Doobie Brothers really hit their stride on sophomore full-length Toulouse Street. After landing in July 1972, it climbed to #21 on the Billboard 200. It also took flight as the first album to showcase a solid two-drummer foundation with the addition of Michael Hossack accompanying John Hartman. Among many highlights, opener "Listen to the Music" ranks among their most popular material, generating a staggering 622 million Spotify streams and counting.