There is a group called Samaritan Revival that has been translating and recording English christian worship songs into Spanish since 2007. They have six CD's recorded from artists like Casting Crowns, MercyMe, Chris Tomlin, Third Day and many others.
You can find all their songs at http://www.samaritanrevival.com/downloads
You can find them on their youtube page at http://www.youtube.com/samaritanrevival
There is also a link beside each song where you can copy the Spanish lyrics.