"X Marks the Spot!" is a Sesame Street song about the letter X, sung by Sherlock Hemlock on The Muppet Alphabet Album, and later taped as a segment on the show. The items included in the song were an X target, a crossroad sign, an X-ray machine, a railroad crossing sign, a skull-and-crossbones sign which was a symbol for danger, poison and pirates. And finally, a xylophone.

Releases

Audio (album version)

• The Muppet Alphabet Album (1971)
• Muppet XYZ (single, 1971)
• Letters ...and Numbers, Too! (1974)
• Muppet XYZ (single, 1976)
• Sing the Alphabet (1996)

Online

• Sesamestreet.org (SSvideo)
• The Sesame Street Podcast: The Letter X

Other

• Letters (computer game) (released as audio)