[Nosferatu@Cult Labs]

Originally Posted by J Harker

The zither music ruins The Third Man because it's shit.

Many would disagree with you, including those who bought the single and sent it to the top of the Billboard chart in the US! From Wikipedia:

The theme became popular with audiences soon after the film's premiere, and more than half a million copies of "The Third Man Theme" record were sold within weeks of the film's release.

The tune was originally released in the U.K. in 1949, where it was known as "The Harry Lime Theme". Following its release in the U.S. in 1950 (see 1950 in music), "The Third Man Theme" spent 11 weeks at number one on Billboard's U.S. Best Sellers in Stores chart, from April 29 to July 8. Its success led to a trend in releasing film theme music as singles. A guitar version by Guy Lombardo also sold strongly. Four other versions charted in the U.S. during 1950. According to Faber and Faber, the different versions of the theme have collectively sold an estimated forty million copies.

Karas also performed "The Third Man Theme" and other zither music for the 1951–1952 syndicated radio series, The Adventures of Harry Lime, a Third Man prequel produced in London. Orson Welles reprised his role as Harry Lime. "Whenever he entered a restaurant in those years, the band would strike up Anton Karas's "Third Man Theme", wrote Welles biographer Joseph McBride.