The composer of the series Jeff Russo did an interview and talked a bit about his approach, starts talking about Alien at around 47:10
"We have been having conversations about Alien already and wow, thats been mindblowing. Its really an intense character study."
"I will have a little more leeway with Alien (than with Star Trek). There are existing themes that perphaps I will choose to include. We have been talking about what things we can and will utilize, if any. Its more of a storytelling style than a motif than Noah is interested in. The scripts are incredible."
"Noah called me the other day and told me "with Alien melody is your friend.""