'Have You Seen Molly?' DJ -- Madonna's Right ... My Song Ain't About Drugs

The song in the middle of the Madonna ecstasy controversy isn't about drugs ... it's about a girl named "Molly" ... this according to the guy who wrote the lyrics.

You'll recall -- Madonna appeared at the Ultra Music Festival in Miami this weekend ... and asked the crowd, "How many people in this crowd have seen Molly?" In case you didn't know ... "Molly" is a slang term for MDMA, the key ingredient in ecstasy.

DeadMau5 slammed Madonna for encouraging drug use -- but Madonna responded today, insisting she was simply referring to a friend's song called "Have You Seen Molly?"

Now, this "friend" -- a DJ named Cedric Gervais (left) -- is coming to Madonna's defense, insisting his song is NOT about drugs ... it's about a girl named Molly who, according to the lyrics, "makes me want to dance." See below for the yet-to-be-released song's "teaser" video that was definitely not inspired by party drugs.