About 10,000 copies have been sold and yesterday it was at number 10 in the charts, a drop of three places on Tuesday.
Marching On Together was originally known as Leeds! Leeds! Leeds! and was the B-side of the club's 1972 FA Cup final single.
It has been given its new release on the Laserdiscs record label of Leeds fan Kevin Smith.
Sales have been boosted by word of mouth and promotion on a Facebook group page which has attracted more than 30,000 members.