Many of Javier Solís’ recordings are still under copyright protection (often 70-100 years post-creation depending on Mexico’s IP law). Downloading from unauthorized sources is piracy. However, there are and better alternatives :
Para asegurarte de obtener la discografía completa y no solo fragmentos, sigue estos pasos recomendados: La Voz del Bolero: Guía Definitiva para Descargar
A: 320kbps MP3 or 16-bit FLAC. His boleros have dynamic range that suffers at 128kbps. La Voz del Bolero: Guía Definitiva para Descargar
A "better download" organization should look like this: La Voz del Bolero: Guía Definitiva para Descargar