At my old parish instead of having song books they chose to photocopy the songs and responses that they would use for a couple of weeks and leave the photocopied page in the pews.
For some of the songs they would have instructions - such as "please repeat after cantor".
I remember one song in particular they used to use as a responsorial. They listed the title followed by the instructions. It looked something like this:
"If Today You Hear His Voice" please repeat after cantor.
Well, I guess there are worse things you can do if you hear His voice.