 Complete the following phrase:  Three years later, in the spring of 2011, the band released their second album, Mapas Maps, which also became popular. It had a more complex and minor-key sound than Un día en el mundo. The next year, having rich tour experience and two full-length albums, the band decided to undertake an experiment by recording with the Regional Symphony Orchestra of Murcia in order to raise money for the restoration of the Narfiso Yepes de Lorca Conservatory building in the city of Murcia, which had been damaged in an 