If you get yourself Legend of Zelda: Ocarina of Time for the Nintendo 3DS, and live in the US or Canada, you can net yourself a completely free OST of one of the greatest games ever created.
On the Club Nintendo official page, they have the offer’s details up. Very simple to get, and well worth the effort of getting. The OST contains 50 tracks from the game including an undisclosed amount of unreleased tracks, and a fully orchestrated medley exclusive to the OST.
Small bonus, some new character illustrations from Miyamoto and Kondo. Small change compared to a free 51-track OST. This is in limited supply so get it when the chance presents itself. Ocarina of Time will be coming out on the 19th, so there really is no excuse to miss out on a chance at a free soundtrack.