Letter U, Letter U Song, Letter U Sound, Alphabet Letter U.\r \r The Letter U Song by Have Fun Teaching is a great way to learn all about the Letter U. Use this music video to teach and learn the Alphabet, Phonics, the Short Vowel U Sound, the Long Vowel U Sound, Vocabulary Words with the Short U Sound and Long U Sound, Letter U Handwriting, and How to Write the Uppercase and Lowercase Letter U.