Replying to What's the real deal with music licensing?

so i'm sure every one has some idea what it is but my question is when do you really need it. obviously for more professional movies by poorboyz and level 1 and other companies that sell movies for profit need it. but for a lot of us here who make videos for ourselves or possibly to sell to some friends, is it still necessary. my guess would be technically yes, but not important enough to bother with some