http://ABCmouse.com/LearnMore "The Letter X Song" (See below for lyrics) "The Letter X Song" explodes with the exciting rhythms of hip-hop music, which originated in the 1970s in New York City. Next time you and your child listen to "The Letter X Song", note how the background singers' X beatbox sound flows perfectly with the rap style of the lead singer. Since beatbox and rap are forms of making sounds and poetry, encourage your child to come up with their own beatbox sounds and raps! About