Most fans know Jose Feliciano for composing and performing the theme to the 70's sitcom, Chico & The Man, but he was a well-respected recording artist long before then. In 1970, Feliciano recorded "Feliz Navidad", which, of course, is Spanish for "Merry Christmas". The bi-lingual carol has been a staple of the season ever since, and with good reason.
The flip side of the "Feliz" single was Feliciano's take on "The Little Drummer Boy", and that may be up soon if I can find it. Ognet uploaded this more recent vintage performance of "Feliz".