While looking for fresh songs to greet the children in the mornings, I found this great website from a Colombian project, Canto Alegre (Happy Song), with free songs in Spanish sang by children.
At first, I didn't recognized the project, but when I listened to the songs, I realized I grew up listening to those songs. It's a great project from a non-profit organization, so that's why the songs are free to download because they believe music should be free to be shared with everyone. If you're interested, please check out their great web site:
The page is in Spanish, so if you go to the tab "Descargas," you'll find the option to listen to or download each song, and the lyrics for each the song will be on the right side of the page once you had clicked on one song.
And, here's the link to their main page: http://www.cantoalegre.org/