I am the canter at my local Catholic Church, and need to discretely say "all together" in Latin to invite people to sing the response for the Kyrie, and other chants.
I've found a few words that might match the meaning I'm looking for, but I'm not very experienced with Latin grammatical rules, and don't want to say something that cannot be used by itself. I rather learn the translations of the chants by heart, and therefore only know the words I ever had to use when signing.
These two sources provide a few plausible expressions:
Or is there a commonly used expression that canters or the priest use to indicate to the assembly to sing along?