The Gnossiennes were composed by Satie in the decade following the composition of the Trois Sarabandes (1887) and the Trois Gymnopédies (1888). Like these Sarabandes and Gymnopédies, the Gnossiennes are often considered dances. It is not certain that this qualification comes from Satie himself – the sarabande and the Gymnopaedia were at least historically known as dances.
These Three Gnossiennes were composed around 1890 and first published in 1893. A revision prior to publication in 1893 is not unlikely; the 2nd Gnossienne may even have been composed in that year (it has "April 1893" as date on the manuscript). The piano solo versions of the first three Gnossiennes are without time signatures or bar lines, which is known as free time.
The transcription of the third Gnossienne for organ is by Marco Lo Muscio.
http://www.marcolomuscio.com