Apple won’t take the wraps off of its upcoming Beats-based music streaming service at its March 9 “Spring Forward” event, according to music industry sources briefed on the launch timeline. Instead, Apple currently plans to introduce the service, at least in beta form, at its Worldwide Developers Conference (WWDC) in early June. The WWDC keynote likely takes place on Monday, June 8th, and that’s the event where the debut will occur. The new iTunes music streaming service is based on technology acquired from Beats Music, including curated playlists, cloud-based libraries, and offerings customized to the musical tastes of individual users. The service will be priced as high as $7.99 per month, which is less expensive than current $9.99 pricing for Beats Music, Spotify, and Rdio…

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