In the books everything from mannerisms, clothing, forms of speach, etc etc, all the way to yes, the hair is often done differently between free and slave.

It is actually in the books very common for Free Gorean Women to braid thier hair.

Only slaves in most of the cultures presented on Gor are commonly forbidden the braid.

It is one way to draw a distinction between the slave and the free.

Music is also described and it's importantance to many different cultures in the fictional setting of the books is addressed numerous times. Some descriptions are so detailed people have actually been able to create postulated instruments based upon them.

The music itself however is impossible to reproduce. Norman didnt give us any sheet music, all we have to go on is his discriptions of various themes, which varied from culture to culture, just like they do here on earth.