The Dukes of Stratosphear were an English rock band formed in 1984 by Andy Partridge, Colin Moulding, Dave Gregory, and Ian Gregory. Modeled after psychedelic pop groups from the 1960s, the Dukes were initially publicised by Virgin Records as a mysterious new act, but were actually an XTC spin-off band. They recorded only two albums: 25 O'Clock and Psonic Psunspot. In the UK, the records outsold XTC's then-current albums The Big Express and Skylarking.
Partridge envisioned the Dukes as an amalgamation of "your favourite bands from 1967." He and Dave Gregory conceived the project in 1979, but it was not until December 1984 that the band found the opportunity to spend a few days recording what would become 25 O'Clock. Three rules were set for its production: songs must follow the conventions of 1967 and 1968 psychedelia, no more than two takes allowed, and use vintage equipment wherever possible. After reuniting for the LP Psonic Psunspot, XTC told interviewers that the group were killed in a "horrible sherbet accident".