Spain was one of the worst-hit nations in Europe in the aftermath of the 2008 financial meltdown. It's still suffering high inflation, high unemployment and low growth, with latest estimates suggesting the country hasn't yet emerged from recession.

The idea of the band working for nothing came from frontman Jon Bon Jovi himself. "When we were planning the tour we did a study and found that, due to the economic situation, Spain was not on the road map," He tells El Mundo. "But we didn't want to stop playing to the fans of a country that's treated me so well for 30 years."