I was so excited to stumble upon this site called Music with Sara. We learn Social Studies in spanish so I was in desperate search of a cute Valentine's Day song in spanish and I found the super cute one you see below. (It's actually in both English and Spanish)
Click on the picture to go to musicwithsara.com. There are more great songs in spanish.
The video below is another great Valentine's Day song. It is in English and can be used when the Language of the Day is English.