Hot hide glue is best if you're set up for it, otherwise red Titebond is a close second. Be sure to carefully scrape all of the old glue off of the gluing surfaces of the top and the bridge. You want to glue wood to wood, and with some clamping pressure. If you use hot hide glue, and you're sure that it was used for the original build, you don't need to be as scrupulous with cleaning the surfaces, because hot hide glue will bond to itself.