Question: What group, that spent 27 weeks at the top of the UK albums chart in 1967, featured Albert Stubbins on the cover of their album?
Sentence (from "Sgt. Pepper's Lonely Hearts Club Band"): On release, the album was lauded by the vast majority of critics for its innovations in music production, songwriting and graphic design, for bridging a cultural divide between popular music and legitimate art, and for providing a musical representation of its generation and the contemporary counterculture.
Relevant evidence: No