How do I confirm my music is in Gracenote?

When you say "my music," do you mean something you created (ex. your original music) or a CD/song file that you own?
If it's the CD/file that you own, you can use our APIs (MusicID-CD or MusicID-File, to be specific) to recognize them. And if they are in our database, which in most cases they should, you will get a match and returned related music metadata.