Alzheimers striking - help with a song title pls

[Paraboliccurve]

This is bizarre, I'm losing the ability to remember anything. (It's not Alzheimers, at least I hope it's not.)

What's the artist/song - not Gil Mateo: 'If you can't say something nice about my baby don't say nothing at all.'

Very well known 70s - it's on the tip of my tongue but it has been there for about three hours.

TIA!

[Micksmix]

 

[Paraboliccurve]

Thanks Mick - how I couldn't remember that I don't know.