And it's been announced that both bands will perform full sets on the night and both will be filmed for a future DVD release.
Touchstone guitarist Adam Hodgson says: “It’s really special to be doing this concert with Magenta, as some of our best early shows were with them at The Point in Cardiff and we have such a long history together.
“We’re looking forward to a special all-band jam at the end. I have a feeling there might also be some other party crashers.”
Magenta mainman Rob Reed adds: “We've been looking forward to filming a new DVD with the current lineup and it’s been almost 10 years since our last DVD.
“The Assembly in Leamington is a great venue – it looks and sounds fantastic. Playing with Touchstone will make the evening a treat for fans and members of both bands."