Many of the[technological changes occurring in the early and mid-20th century were integral for the development of pop music. True
False

Answer nationalistic music;

Photography has changed its subject matter quite a lot over the past few years. in the 1800's, it was considered normal for families to have  post mortem photos of their loved ones, and now that would be completely unacceptable. i think that photographers have always pushed boundaries and have been eager to capture everything, it is just society that changes their boundaries.