"autumn '68", named in reference to the 1970 pink floyd song "summer '68", features a recording of wright playing the royal albert hall pipe organ during the rehearsal for a show on 26 june 1969. "talkin' hawkin'" contains a sample of scientist stephen hawking's speech taken from a british telecom commercial also sampled for "the division bell" on "keep talking". mason received writing credits for "sum", and "skins", a two-and-a-half-minute drum solo. gilmour said that he was "pretty certain" that "the endless river" would be the final pink floyd album.