“First of May" is a song by the Bee Gees with lead
vocals by Barry Gibb, released as a single from their 1969 double album Odessa.
Barry says in Tales from the Brothers Gibb that the title of
the song came from the birthday of his dog, Barnaby.
The song was partially responsible for the departure of
Robin Gibb from the Bee Gees. Robin had wanted his song, "Lamplight,"
to be the album's first single, while Barry preferred "First of May."
In the end, Barry's judgment won, and Robin quit the band.