That is what we discovered on Wikipedia concerning the Echoes of Pink Floyd:

Echoes: The Best of Pink Floyd is the fourth compilation album by the English rock band Pink Floyd, released on 5 November 2001 by EMI internationally and a day later by Capitol Records in the United States. It debuted at No. 2 on the Billboard 200 album chart on 24 November 2001, with sales of 214,650 copies. It remained on the chart for 26 weeks. The album was certified gold, platinum and double platinum on 6 December 2001 in the US by the RIAA. It was certified triple platinum in the US on 8 January 2002, and quadruple platinum on 10 September 2007.