The answer is and. The first sentence can read Galicia has a Celtic heritage. The second sentence is One of it’s traditional instrument is the bagpipe. You could even change the last one to read, The bagpipe is one of the traditional instruments.
The aim is to find improvements in the essay, through a new pair of eyes that can first be read in the essay and can enhance our essay, and can also be helpful if they see our essay as being attractive to readers.