Ezrin doesn't sing. He plays the piano.

Roger sings everything, with other people harmonizing on "craaaazy, toys in the attic" and possibly with Gilmour helping him sing the Judge's part. I've never been able to tell exactly who does that bit but it's certainly not Bob Ezrin, a soft-spoken Canadian lad!

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what do you teach your children about me?
what do you teach your little children about me?
pimp, thug, bling drug lord of the undergrounded kings
how can you be so sure i won't call down the rain?
what do you teach your little children about me?
you point your gun, wait, hide and run. i see it plain