Passing the time in iTunes (always a dangerous course of action, I understand) I popped "Brigit" in the search field and discovered fellow Canadian Bruce Mitchell's album New Earth Goddess, with its track, "Brigit". A sample tells me this is a rich and rumbling instrumental track. You can find it in various places besides iTunes, but I will give you that link and if you want CDBaby (which is down at the moment) or some other thing you will find it there, too. $0.99 will get you the song. For a review of the album by New Age Music World, pop over here.
For a lighter and more skipping instrumental track by the same name, try Ruaidhri's "Brigit" on his album Celtic Goddess. Also $0.99,
In a much gravellier, grittier vein, the song "Brigit's Cross" by Steve Von Till on his The Grave is a Grim Horse doesn't have a huge amount to do with Brigit but it does protest the primacy of the pre-Christian religion. I liked it. Here is a link to a YouTube rendering, and below are the lyrics. It, too, is $0.99 on iTunes.