Baroness Thatcher's death could propel The Wizard Of Oz track Ding Dong The Witch Is Dead into the top 40 of the singles chart.
The late former prime minister divided opinion and - while many have mourned - some have seen her death as a cause for celebration, prompting a download surge for the track.
In the space of less than 12 hours Judy Garland's version had made it to number 54 according to the latest sales figures collated for the Official Charts Company. It is expected to climb higher as a result of a Facebook campaign being set up to encourage sales.
There has been some speculation that it may be too short to qualify at just 51 seconds, but chart bosses say it is eligible. In 2007 the track The Ladies Bras by Wisbey made the chart despite lasting just 36 seconds.
Garland's version is not the only one to be selling. A performance by Ella Fitzgerald is at 146 and one by the Munchkins is at 183. If sales of the three versions had been combined it would be selling strongly enough to be at number 40.
The Official Charts Company will release its midweek sales on Wednesday to give an indication of whether it is continuing to sell and the top 40 itself will be announced on Sunday.
Garland's version is also at number 16 in the iTunes chart.
The death has also led to a burst of sales for Elvis Costello's track about Baroness Thatcher - Tramp The Dirt Down - although to a more modest degree.
The song, from his 1989 album Spike, is at number 79 in the iTunes chart.
Respect MP George Galloway referred to the track in a message on Twitter in the wake of her death.