They often say that changes come in waves. Puerto Rico has an interesting relationship with change, from our colonial status remaining mostly unchanged since 1917 to new condos popping up throughout San Juan. And yet, our music is always changing, with new sounds not so much evolving from previous genres but bursting out of the collective ether to not only create change but give it a voice. From bomba y plena to the salsa of the ’70s to reggaetón, the island’s musical history has been defined…