Record Of The Year
(Award to the Artist and to the Producer(s), Recording Engineer(s) and/or Mixer(s), if other than the artist.)
Album Of The Year
(Award to the Artist(s) and to the Album Producer(s), Recording Engineer(s)/Mixer(s) & Mastering Engineer(s), if other than the artist.)
Song Of The Year
(A Songwriter(s) Award. A song is eligible if it was first released or if it first achieved prominence during the Eligibility Year. (Artist names appear in parenthesis.) Singles or Tracks only.)
Now that I read what the site has posted, I don't see the difference between the first two.