Do your students have trouble remembering basic verb endings and other grammatical structures? Do they like music? Of COURSE, to both questions, I'm sure! Have you heard of Etienne? He's the coolest, according to my grade 7 & 8s. What I like about him is that the songs are in the target language, rather than some of the other "educational music" out there that is bilingual.
The other really cool thing, if you are just getting introduced to Etienne for the first time, is that his work is available for download on iTunes, so if you just want to try one song to see how your kids react to his music, it's a very inexpensive and low-risk investment. You can also play full songs from his web site.
I do recommend purchasing his entire teaching packages, where you get the lyrics in photocopiable format, student activities and suggestions, and the CD all for one very reasonable price.
Check out Pourquoi take French? (which is mostly in English, but is a really unique song that really hits home with the students, and they LOVE it!) and his song for teaching the possessive adjectives......
PS... Etienne also has products in SPANISH! Here is one sample song for Spanish ER verbs.