Is "Royalty Free Music" Really Royalty Free?

Well apparently not where the "royalty free music" sold on Amazon.com and iTunes are concerned.  Fact is you're uses are limited to the personal and non-commercial.  Basically, you can listen to the music and maybe sync it to a presentation that again is personal and non-commercial.  By this definition, all music that reaches your ears hear is royalty free.  Be careful. Read the license of your proposed music library and ask questions if you don't understand.