My son is going go be 5 years old and he is having trouble with his abc's. He can not sing them or repeat them back. Any suggestions would be great?

Make a game of shorter segments in a rhyme like:

A B C D E F G
Will you play a game with me?

Try clapping every syllable of both lines, also.

LZONE, let us know how that goes!

Have you had him tested to find out what might be wrong?
Otherwise maybe listening to them over and over again in some kind of a song might help.

Maybe he's just not an auditory learner. Have you tried introducing the alphabet through toys, blocks, and other concrete or visual means? In general, I'm not a huge fan of video learning, but the leapfrog letter factory series is great for getting kids started on phonics.

good luck!

Lorel