The phrase "are in unison" is correct and usable in written English.
It can be used to describe a situation where multiple people or things are acting or speaking together in harmony or agreement.
Example: "The choir members sang beautifully, and their voices were in unison, creating a powerful and moving performance."
Alternatives: "are in agreement" or "are in harmony."
Most teams are in unison on positions 1 through 25.
"Do you live here?" "We have always lived here!" "Do you like it?" "We love it!" Their answers are in unison.
Each haka has its own interpretation but you have to make sure you are in unison with your team-mates; the haka should be a proper war cry.
This has, I guess, always been the case with good books for young children, but Donaldson's light-on-their-feet fables, with their rhythms and repetitions, especially fit the bill, and encourage the eerie idea that at, say, 7.15pm on any given night, tens of thousands of glazed-eyed mums and dads are, in unison, chanting the immortal words: "My tie is a scarf for a cold giraffe".
The TEM studies indicated that the particles were spherical in shape and their sizes are in unison with the DLS size spectra.
The physical characterization was done by nanoparticle tracking analysis and scanning electron microscopy, the results of which are in unison with the digital light scattering data.
Common to all of this was a belief that his work should be in unison with the world.
Their look offers an eerie parallel with the 1970s — the last time that recession and plummeting hemlines were in unison.
I like to get two people in a room to debate it out and, even if everybody is in unison, I'm still going to want the debate.
When the two tones are tuned to the same pitch, they are said to be in unison (ratio 1 1) and their consonance is absolute.
Often the women were in unison, and would then separate, skittering from place to place, pointing distractedly, as though lost or trying to regain a memory.
