The arrangement is crucial to Meerkat, which launched to much acclaim at the South By Southwest show in Austin in March, only to be upstaged later by the release of Twitter’s Periscope app, a rival service.If Meerkat’s experiment with U2 is successful, it could lead to streaming of more shows, sporting events and other live events. Already, bands such as One Republic, Rascal Flatts and Questlove are “Meerkat-ing” themselves on tour.