If you want to own the music, check out digital stores like iTunes or physical vinyl re-editions for the best audio quality.
Instead of risky "free download" sites that often contain malware or low-quality rips, you can stream his entire discography for free on these platforms: alejandro sanz discografia descargar free
Files labeled as MP3s are frequently used to hide viruses or spyware. If you want to own the music, check