Anyone use or recommend any of the following legal MP3 commercial music 'pay for download' online services? Which one has the best or largest library of classic commercial pop songs?

RealOne Rhapsody http://www.real.com/rhapsody/

EMusic http://www.emusic.com/pitch.html

Apple iTunes Music Store http://www.apple.com/itunes/

Since the RIAA has recently begun cracking down and prosecuting people who illegally download MP3 songs using peer to peer programs such as Kazaa & Morpheus, it's important to know which 'pay for download' online service provider is the best alternative for downloading songs legally. Feedback & recommendations appreciated. - Scott