To me things like musical preference are distractions. Spend enough energy on them and you'll talk yourself out of any relationship. It also burns effort better spent on real issues that might arise. Rather than looking at the things that might not work, look for - and point out - those that do. When you find enough good stuff and can maintain the desire to make the relationship work it will overcome all the insignificant junk.
The other side of this is that you should feel lucky to be worried about something so trivial.
