"Lost Not Forgotten Archives" is a series of official bootleg releases that has been releasing archival recordings such as live performances, demos, and studio outtakes since 2021. The first release in 2.5 years, the 22nd installment in the series contains live audio from SUMMER SONIC 2010, which was the final performance before Mike Portnoy left the band (he left one month later and returned in October 2023). This show was the final day of the tour for the album "Black Clouds & Silver Linings" released the previous year, and out of a total of 6 songs (7 including the medley), 4 songs are performed from that then-latest album. Because the audio was recorded for a later TV broadcast, it is a high-quality live recording that conveys the band's incredible performance and the audience's excitement with a strong sense of presence. The cover artwork, designed with the timing in mind of being released the week after the Japan tour held in February 2026 ends and of welcoming Japan's cherry blossom season, could be called the most beautiful kaleidoscope design in the series' history. [Product Specs] The Japan edition is a high-quality Blu-spec CD2.