Working with ESL pre-schoolers ages 4. They are bright students, but language skills are minimal...

Any good suggestions to help teach them?

I'm using some music in classes, any suggestions as to some songs that may be useful?

Simple songs like the alphabet song; Three little Monkeys, twinkle twinkle Little star, Baa baa black sheep, other action songs and nursery rhymes; also do picture flash cards for their vocabularies.

Also play lots of games to keep them interested and to learn through them.