this song is by a guy called israel kamakawiwo'le. im pretty sure thats spelt right. and im pretty sure that its not by 'odetta' (sorry letty). it was also used in 50 first dates and a recent advert.
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The track is also on < Facing Future > and yes, it is Israel Kamakawiwo'Ole. I've just checked on Amazon and had a listen.............. the downside is that you need Realplayer to try it.