MSN has launched a multi-channel ad campaign for its downloadable music service with an offer to buy one song and get five free. The theme is "Meet MSN Music." The promotion runs through July 10. ClickZ writes that the campaign is the first big push for the service, which launched in September, and will run across the MSN network, with MSN home page, MSN Entertainment, Hotmail and Messenger placements. Creative and media planning were done through McCann San Francisco. Additional online placements will be made on a mix of music and entertainment sites, including Billboard.com, Ticketmaster, CitySearch, AllMusic.com; networks like BurstMedia, Fastclick and ValueClick; and less targeted buys on community sites like Friendster, MySpace.com and Community Connect.