WIKIPEDIA:

“ Lost Dogs is a two-disc compilation album by the American alternative rock band Pearl Jam, released on November 11, 2003 through Epic Records. The album has been certified gold by the RIAA in the United States.

Overview
Lost Dogs is a double-disc collection of B-sides and other released and unreleased material. Lost Dogs sold 89,500 copies in its first week of release and debuted at number fifteen on the ''Billboard'' 200 chart. Lost Dogs has been certified gold by the RIAA.
A number of songs included on Lost Dogs differ from the originally released versions, including "Alone", "U", "Wash", and "Dirty Frank". The album includes the hidden track "4/20/02" at the end of disc two, a tribute to Alice in Chains frontman Layne Staley. It was written by vocalist Eddie Vedder during the recording sessions for Riot Act on the day that he heard the news of Staley's death. The song features only Vedder singing and playing the guitar in a ukulele-inspired tuning. According to Vedder, the reason why it was not included on Riot Act was that the band already had too many songs. According to guitarist Mike McCready, the reason the song was only featured as a hidden track on [......] ”

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