Personal computers musicians create and store new sounds.

It is true but sometimes it depends on the software 

This is true! So many "stars" out there use their computers to store their 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.

This is called adduction