A mummy’s favorite type of music is wrap music.

The joke explained

  • The riddle plays on the word “wrap,” which sounds like “rap,” the music genre.
  • Mummies are literally wrapped in bandages, so “wrap music” is a pun linking their bandages to the sound-alike music style.

Where this joke appears

  • It shows up in kids’ joke collections, Halloween riddle sites, and forum posts with the exact Q&A: “What is a mummy’s favorite type of music? Wrap.”

TL;DR: The answer is “wrap music” because mummies are wrapped in bandages, making it a wordplay on “rap music.”

Information gathered from public forums or data available on the internet and portrayed here.