David Gilmour & Richard Wright playing live from Abbey Road. Astronomy Domine is a song written and composed by Syd Barrett. It was the first track featured on Pink Floyd’s debut album, The Piper at the Gates of Dawn.

There is some Morse code at the beginning of this song, which was a way to transmit messages using a series of long and short tones. Plenty of people tried to decipher the code in this song, only to realise it was just a random series of tones with no meaning.