LLC or Sole Proprietorship (in GA)?

I am a young songwriter looking to start my "songwriting business." I will purchase sheet music, go to concerts, pay for demos, buy instruments, etc. Sometimes I will travel to conventions and pay for membership fees to organizations. I have a real job too where I make 100k+. Should I start my business as an LLC or Sole Proprietorship? I don't expect to make any money for 2 years, but I'll have expenses. Please let me know what you think I should do based on my situation. Thanks!