From the Site:
WHO IT’S FOR
This site is not for listening to polished, professional recordings. It is intended as a resource for traditional musicians wishing to learn a tune or remember how particular tunes are played.

WHAT YOU’LL FIND
Short MP3 audio clips, sheet music and ABC notation for most of the tunes are posted, and can be downloaded for use in other software for learning.

MUSICAL GENRES
The site focuses on dance and fiddle tunes from several regions around the North Atlantic: Scandinavia, the British Isles, Québec, Maritime Canada including Cape Breton, Métis (Saskatchewan & Manitoba), New England, Appalachia, and more (even a tune from Texas, but with obvious Irish influences).

Musical forms include jigs, reels, hornpipes, waltzes, marches, walking tunes, quadrilles, mazurkas, slow airs, laments, polskas and even a rant (a Northumbrian dance form similar to a reel).