I too find the new themes (other than Rey’s which is rather like something out of John Ford Western) a bit uninspired.
All the films 1-6 had memorable themes you could hum or whistle after leaving the cinema.
I didn’t have one this time.
BB8’s vocalisations were really good though, different from Artoo but as emotive.
The whole performance of BB8 was up with the droids in the first 2.5 movies and made me almost forget the indignities thrown at the true saga heroes in the prequels.