Back in May of last year, David Bowie made a surprise appearance at a Pink Floyd concert at Royal Albert Hall to lend vocals to Arnold Layne and Comfortably Numb. According to guitarist David Gilmour’s website, footage from the performance will be released on a 2-disc DVD set titled Remember That Night. Disc 1 will have the Royal Albert Hall concerts and disc 2 will contain 3 Floyd documentaries. Rumors had the release date as late March, but the authoring process for the Blu-Ray and HD-DVD formats have pushed it back to May or thereafter.