Music can take you back to points in your life in a way that few things can.
People should always listen to new and old music, like books or movies/shows, sometimes repeated listens, viewings, or reads, can open up new aspects of the music, something you didn't see or hear before.
I find the same thing with foods as well. When I discover a new dish/restaurant I love, I will have it several times and relish in the new flavors/atmosphere. After a while, I still love and enjoy that dish/restaurant, but now the thrill has been replaced by a more comforting and familiar association with a fun night out.
Another example, growing up, I was only allowed to drink Coke when we ate out or went on picnics, or attended sporting events. As a result, as an adult, my brain made an association between drinking coke and having a good time.
I have a lot of emotional/memory attachments to certain music - it ties in with a lot of specific events in life. Listening to those 'same old stuff' albums/songs can take me back to places when I want to reminisce. I can get some of the same feelings, even smells and tastes sometimes, with the 'same old stuff'.
Not all of those are 'old' like decades ago - I've got some stuff that I started digging in to just a few years ago which is now in my 'heavy rotation'.