Who goes on tour with musicians?

[elginrocker]

I've been to a few concerts of famous musicians and have seen youtube videos from Wiz Khalifa to Taylor Swift that have an entourage of people that go with them on tour. I know some of them are friends and family but who are the other people and what jobs do they have? The reason I'm asking is because I want to get career in the music industry and somehow find one of those jobs.