180 gram audiophile demonstration & test disc! a treat to listen to, a great way to test and show off your system. This audiophile demonstration album contains 13 tracks which were recorded with 50 year old Neumann valve microphones. Many tracks use the "Decca tree" configuration, invented by engineers in the early 1950's using 3 Neumann M50 microphones. Some tracks were recorded with a 1/2" Studer reel to reel recorder running at 30ips. This audiophile disc was used as a reference by Michael Fremer of Analog Planet in testing various record mats. The album contains selections from composers and musicians that include Vivaldi, Mozart, Ellington, Rachmaninoff, Verdi, and more!