The B song wonders what the world would be like without the letter B. Brainstorm words with the B sound and then try leaving it out. Simple omission of the sound in words can yield hilarious results; bacon becomes "acon,"  bathroom becomes "athroom."
   As a follow-up, gather items around your home that contain the letter B (blocks, balls, brush, beads) and collect these in a 'baggie book'.
  To make the book, staple together the bottom edges of 4 or 5 zip-lock baggies and reinforce with masking tape. Each bag becomes a 'page' in the book, inside of which you can store your B goodies. Talk about what the items would be called if there were no letter B. Re-use the baggie book for collecting things pertaining to other letters. And of course, play the omission game with other letters. Children never tire of language play and nonsense words as they learn the alphabet..