Revolver was notable for experimenting with Eastern influences, tape loops, sampling, backward music, baroque pop sections, and rougher guitar parts. You have to remember this was 1966 and this was before The Doors or Pink Floyd had recorded their debut albums
One common criticism of Sgt. Pepper that this album was released after albums like Absolutely Free, Velvet Underground or Younger Than Yesterday which of course did nothing on the pop charts. This of course does nothing to tarnish Sgt. Peppers influence as none of the albums mentioned have hardly anything in common with Sgt. Pepper.
In reality Sgt. Pepper combines many of Revolver musical experimentations with bombastic presentation and its focus on recurring melodies and fanfares creating an album unlike any before which in turn influenced everything from prog rock to Brit-pop
The gatefold album cover to the lyrics on the inside sleeve and cover art featuring iconic movie stars and other famous people with the Beatles dressed in their band costumes
The influence of Sgt. Peppers on the progressive rock movement extends past rock heavy weight bands Genesis, Yes and Pink Floyd, King Crimson, to a lot of contemporary progressive rock bands today. The biographical elements of Big Big Train's English Electric parts 1 and 2 and use of brass instruments on these albums hacks back to the Sgt. Peppers album. The Flower Kings suite, Garden of Dreams, on the album Flower Power, has an orchestral intro at the start and then is reprised near the end of the suite. The silence at the end of A Day in the Life followed by the voice loop just when you think the song is finished inspired many bands to use voices, as effects, in their songs.