You probably don't. Not every service is made for every (potential) customer. Rdio/MOG/Rhapsody are for a segment of music listeners that like music enough that they are willing to pay ~$120 a year for unlimited streaming but not enough to have the really obscure tastes that those services don't provide. Google Music, Amazon MP3, MP3Tunes and other "locker services" are for people who want to stream their music, but don't buy enough to warrant a monthly subscription.