In 1984, Ray Parker Jr. was signed by the producers of Ghostbusters to develop the film's title song. Later that year, Huey Lewis and the News sued Parker, citing the similarities between the "Ghostbusters" song and their earlier hit "I Want a New Drug." According to Huey Lewis and the News, this was especially damaging to them since "Ghostbusters" was so popular, rising to number one on the charts for three weeks. The dispute was ultimately settled out of court. Lewis has stated that his experiences with the producers of Ghostbusters were indirectly responsible for getting involved in the 1985 movie Back to the Future.  In the 2001 Behind the Music special, Huey Lewis stated: "The offensive part was not so much that Ray Parker Jr. had ripped this song off, it was kind of symbolic of an industry that wants something - they wanted our wave, and they wanted to buy it. ... [I]t's not for sale. ... In the end, I suppose they were right. I suppose it was for sale, because, basically, they bought it." As a result of this statement, Parker filed a suit against Lewis, claiming he violated the settlement's confidentiality agreement and sought an unspecified amount of compensatory and punitive damages as well as attorney's fees.  An issue of Premiere magazine would later feature an anniversary article about the movie Ghostbusters. In that article, the filmmakers at Columbia Pictures admit to using the song "I Want a New Drug" as temporary background music in many scenes. They then said that they had made an offer to Huey Lewis and the News to write the main theme, but the band declined. In a 2001 Behind the Music special, Lewis said that the band declined the filmmakers' offer because the band had a prior contractual obligation to do a long concert tour to promote the hugely successful Sports album, which had just been released at the time, and didn't have time to write a main theme for a movie. The filmmakers gave film footage - with the Huey Lewis song in the background - to Ray Parker Jr., to aid Parker in writing the theme song.

Answer this question "what did they do after" by extracting the answer from the text above.
In the 2001 Behind the Music special, Huey Lewis stated: "The offensive part was not so much that Ray Parker Jr. had ripped this song off,