I like the band Reik. Their albums Reik and Secuencia are good and have helped me with my Spanish. There are also Christian artists Jesús Adrián Romero and Alex Campos - both pretty good and with discernable lyrics, especially Romero. All of these have done wonders for my Spanish comprehension. Type "Jesús Adrián Romero" on YouTube and you'll get a lot of results of live performances with good quality recording.
Fernando Ortega has Spanish songs - not sure if they're his own work or not. Can't give any titles either - I've listened to them, but not having any Spanish, all I can really say is that they're musically very pleasant!
What's wrong with the One Semester of Spanish Love Song?
[video=youtube;ngRq82c8Baw]http://www.youtube.com/watch?v=ngRq82c8Baw[/video]
And let's not forget the second compilation, the Second Semester of Spanish Love Song... classic hits I tell ya.
[video=youtube;uNuGKbwRudE]http://www.youtube.com/watch?v=uNuGKbwRudE[/video]