Programme celebrating the archive of this legendary BBC jazz concert show from the mid 1960s, so titled because the newly launched BBC 2 was broadcasting on 625-UHF lines (the HD of the time) unlike the 405-VHF of BBC 1 and ITV. It features classic performances from legends such as Duke Ellington, Dave Brubeck and Dizzy Gillespie and the Julian 'Cannonball' Adderley Sextet, alongside rarely seen sessions from the likes of Wes Montgomery, Marian McPartland, Chris Barber's Jazz Band and Willie 'The Lion' Smith.