Of course, "La Bamba" is one of those collected and conserved traditional folk songs in the twentieth century, which are royalty and copyright free because they are traditionals with a far and uncertain origin like as example also "Guantanamera" or "Malaguena". These songs are not that difficult to learn on guitar because the chords and riffs are easy.
A fair and modern interpretation is given by Belle Perez, a Flemish singer/songwriter with Spanish roots, who mixes the song with the rock classic "Twist and Shout".