I agree with most of the posters already, the Robotech BGMs are some of the best ever in anime, especially given when they were composed in the early 80s. Especially the starting theme for Robotech, which blows most other themes out of the water.
I also agree that the Reba West songs are horrid, horrid things that should never have been made in the first place, but the BGMs more than make up for those.
Whenever I watch Macross, Southern Cross, or Mospeada, I can't help but wish I were listening to the Robotech music in them.