Egill singing and playing the guitar with the drums from the Yamaha organ. But it could be that someone else is playing the guitar and then likely Árni Björnsson or Júlíus Jónasson.
My parents kept a cassette with the recordings of the songs my older brothers made. To make sure the songs survived that old cassette, I published the album Bræðraminning, which also includes my takes on their songs.