You can find a whole list of MP3s available on Amazon about Los Reyes Magos. They are all inexpensive, but naturally, there were just a few in particular that I enjoyed. Below you will find three very different versions/styles of music dedicated Los Reyes. If you follow the link to their Amazon page, you can listen to a sample of each one.
Ya vienen los Reyes (aff link) by Rayito is a beautiful version, that is easy to sing along with... though I think mamis will like this version better than los niños. It is available on the album, Queridos Reyes Magos (aff)($6.99), or as a single MP3 (aff) for $.89. It is also available in a CD format ($25.00 and up).
Los Tres Reyes Magos (aff) by José-Luis Orozco. Of course, you can't go wrong with Orozco's clear, strong voice and musical arrangements. I very much like listening to just the sound of him singing and playing his guitar - it doesn't distract me from the music itself. It is available on his album, Fiestas - Vol 6. (aff) for $9.49, or as a single MP3 (aff) for $.99. It is also available in a CD format ($15.98).
Con mucho cariño...