I've no doubt that "Out the Gap" is just an adaptation of "Chez Seychelles"
And I'm sure that "Chez Seychelles" was adapted from a traditional tune from the Seychelles Islands by Michael Doucet of Beausoleil as he has said.

leeneia - "The islands were named after Jean Moreau de Seychelles, Louis XV's Minister of Finance." from Wikipedia

Here's a musical score and a midi for "Chez Seychelles"

Cheers, S. in Seattle