ABCs

I sing the ABCs to Braylon all the time.  Lately, I have just been singing the first four so he could catch on.  It only took a few times of me singing ABCD for him to repeat it back to me.  He now will sing "A-B-C-B (not 'D')."  He will just spontaneously start singing "A-B-C-B" while he's playing.