Q: over 100 of my songs stored in my library have an exclamation point next to them.  When I click on the song it says that the song will  not be downloaded to my phone because the original song cannot be found, and would I like to locate it? I need help!!!

Over 100 of my songs in my itunes library have an exclamation point next to them.  When I attempt to sync them with my phone it says that the song cannot be synced because it cannot locate the original song? Do I want to locate it? Can anyone help me figure out where my music is on my computer and where to locate it and how to send it back to itunes?