Copyright is not the only issue here, as it is not the whole of intellectual property law. When the Red Hot Chili Peppers sued Showtime over the television show Californication, for instance, the issue was unfair competition and dilution. The suit involves a pair of claims: one against the show, and another against the soundtrack. It is the latter part that really carries the suit, since it is hard to argue for brand confusion between a television show and a musical recording (no matter how many elements the show took from the band). A soundtrack and an album with the same name, however, is a different story.
The case would have been even stronger if the Red Hot Chili Peppers, or their lawyers, had thought to sue for unjust enrichment instead (basically, making a claim that the television show was leeching off the album’s popularity). Why they didn’t do this, I don’t know. The point, though, is that this is another way of going after someone who copies something without breaking any basic copyright law.
In your case, however, I doubt that either dilution or unjust enrichment would be successful charges against you. I also doubt that either the author’s estate (O’Dell died in 1989) or the publisher (Houghton Mifflin Harcourt) would care to go after you on it. Your band simply isn’t a threat to book sales, nor is it riding off of the book’s success. If anything, the publisher might be glad for a little publicity.
Standard disclaimer: I am not a lawyer. The above is based on seminars I’ve taken on copyright law and discussions with colleagues who have studied and/or practiced copyright law. The information may be out of date or based on a misunderstanding. It is always advisable to speak to a practicing lawyer.