A greatest hits album is the musical equivalent of treading water. It is a means to avoid sinking into obscurity under a tidal wave of newer releases. It serves to remind the public of an artists’ continued existence. It helps bands cash in on Christmas season if they have nothing else to sell. It is therefore entirely fitting that Nickelback, a band that has perfected the art of going through the motions, has released a greatest hits album just in time for the holidays.