TV soundtracks can be ways to discover new music, or just for a studio to cash in on a hot property. CBS Music's Hawaii Five-O: Original Songs From The Television Series is a bit of both.It wouldn't be the first time that a soundtrack has come out for sheer merchandising purposes. There are a lot of those, where songs clearly end up in a TV show just to push a single or so that a CD can be made up later. Heck, even some of the soundtracks that come out after a season aren't very good.Hawaii Five-O's disc curiously takes the opposite tack from most soundtracks: the CD is billed on Amazon as con