Where (or how) can I check to see if the song I've made has already been done?

So I came up with a track, but I wanna make sure that I'm not copying someone else's work. Is there somewhere I can look to make sure it's different?

Submitted November 19, 2016 at 05:32PM by Phenomabob-omb https://www.reddit.com/r/edmproduction/comments/5dudo5/where_or_how_can_i_check_to_see_if_the_song_ive/?utm_source=ifttt