promote the song, it initially sold fewer than 1,000 copies in the US. It was a major success in the United Kingdom, however, reaching number 1 on the UK Singles Chart. In the US, it eventually reached number 116 on the Billboard Bubbling Under Chart. It was also the biggest-selling single of 1968 in the UK, where it was among the last pop singles issued by HMV before it became an exclusively classical music label. The song made Armstrong the oldest male to top the UK Singles Chart. (His record was broken in 2009 when a remake of "Islands in the Stream" recorded for Comic Relief—which included the 68-year-old Tom Jones—reached number 1.) ABC Records' European distributor EMI forced ABC to issue a What a Wonderful World album in 1968 (catalogue number ABCS-650). It did not chart in the United States, due to ABC not promoting it, but charted in the UK where it was issued by Stateside Records with catalogue number SSL 10247 and peaked on the British chart at number 37. Enduring success The song gradually became something of a standard and reached a new level of popularity. An episode of The Muppet Show produced in 1977 and broadcast early in 1978 featured Rowlf the Dog singing the song to a puppy. In 1978, it was featured in the closing scenes of BBC radio's The Hitchhiker's Guide to the Galaxy, and was repeated for BBC's 1981 TV adaptation of the series. In 1988, Armstrong's recording was used in the film Good Morning, Vietnam (despite its setting in 1965, two years before the song was recorded) and was re-released as a single, reaching number 32 on the Billboard Hot 100 chart in February 1988. It charted at number 1 for the fortnight ending June 27, 1988 on the Australian chart. It is also the closing song for the 1995 movie 12 Monkeys and the 1998 film adaptation of Madeline. When the ABC television sitcom Family Matters premiered in 1989, Armstrong's version of "What a Wonderful World" was used as the show's theme song. However, after the fifth episode, it was replaced by the original song "As Days Go By". In 2001, rappers Ghostface Killah, Raekwon, and the Alchemist released "The Forest," a song that begins with three lines of lyric adapted from "What a Wonderful World", altered to become "an invitation to get high" on marijuana. The rappers and