Tom Lehrer's circa 1970 song about the upcoming conversion of British Sterling currency to decimal currency. To appreciate this, Americans and UK citizens below 40 should understand that up until 1970, four farthings equalled a penny, 12 pence equalled a shilling, 5 shillings equalled a crown, 4 crowns equalled a pound, and 21 shillings equalled a guinea. Also, note that in the intro of this video, David Frost mispronounces Lehrer's name, which rhymes with "bearer".

Decimalisation

Searchable on youtube using keywords "Tom Lehrer Decimal".

[Lyrics]