|Written by||Joe Raposo|
|Publisher||Green Fox Music Inc.|
Jonico Music, Inc.
"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. Among the items Sherlock encounters are an X target, a crossroad sign, an X-ray machine, a railroad crossing sign, a skull-and-crossbones sign (which can be a symbol for danger, poison and pirates), and finally, a xylophone.
- The Muppet Alphabet Album (1971)
- Muppet XYZ (single, 1971)
- Letters ...and Numbers, Too! (1974)
- Muppet XYZ (single, 1976)
- Letters, Numbers and Signs (1977)
- Sesame Street Treasury (1980)
- Sing the Alphabet (1996)
- Lyrical Letters (2014)
- Awesome Alphabet Collection (2019)
- Letters (computer game) (released as audio)