Full title reads: "Now Pathe Pictorial presents: - Bob & Alf Pearson of Radio, Record & Variety fame in harmony (and a piano)."
Bob and Alf sing a song - one plays the piano (not sure which one!) They both look very smart with shiny slicked back hair, black jackets, white shirts and white bow ties. The top of the piano is so shiny, they are reflected in it.
The song they sing is called "By the Fireside" (aka "In The Gloaming, By The Fireside With You") and describes romantic evenings by the fire kissing and canoodling. They segue into a verse of 'Just A Song At Twilight' for part of the song.
Duplicate version in Turns Can 1 - see separate record for details.