Try to do pitch matching: you play a note on the keyboard and ask them to sing it afterwards. You can also have them do that with the Melodic Dictation exercise of EarMaster in Customized training mode.
Today I was working with the group of kids that I said they con not sing good, I did what u said, I played a note on the piano and they could sing it correctly but when we whanted to work on a piece of music they couldn't sing it with correct solfeggio and all of them were falsh and off key
If with a movement of a hand a hank is ended, this endless creative search what is for?
Maybe it's too ambitious to expect them to sing in perfect pitch immediately after matching a pitch played on the piano a couple of times. These things (internalizing pitches) come with time and perseverance. This is why we made a tool like EarMaster
