Here's a look at one of the biggest reasons you should take advantage of the site:
What's The Point?
LinkedIn is great as an easy-to-send online resume and a good way to show recommendations from those you've worked with. However, the most useful function in the music industry, is probably using it to see who you might have connections to. As they say, and I know you've heard, "it's not what you know it's who you know," and LinkedIn is probably the easiest way to figure out exactly who you know.
Once you find someone who you share connections with, click on their name and scroll to the right column towards the middle of their profile where you will find something like this:
This box is actually one of the most valuable features on LinkedIn because it will tell you exactly who you know that is connected to someone you are trying to reach. You can use to as a networking tool to ask for introduction to new people, request recommendations for a job, or get introduced to someone new. It makes it far easier to figure out how you might be connected to a job or a person you never thought of and find an faster way to get your foot in the door and get your application reviewed.