Start-up DoubleTwist makes software designed to help users of devices other than Apple products, such as BlackBerry and Android phones, to organize and keep track of their music. Starting immediately, the DoubleTwist software will now let people buy music files from Amazon’s MP3 store in a more seamless fashion that replicates the iTunes experience by essentially integrating the Amazon store right into their software.

After signing into their Amazon accounts, people will now be able to browse songs, listen to previews and buy songs with just a few clicks. Sometimes Amazon is even cheaper than iTunes. For example, Lady Gaga’s “The Fame Monster” album costs $5 on Amazon, but $7.99 on iTunes (where it also comes with an extra remix song and digital booklet).

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To recap: the ad was designed to promote music-management software offered by doubleTwist, a startup formed by Johansen (known as “DVD Jon” for breaking the copy protection on DVDs). The company arranged to have the ad posted on a glass façade next to a stairway leading to the subway operated by Bay Area Rapid Transit, better known as BART. From some angles, the location made it seem like the ad was on the wall of Apple’s retail store.

The ad first went up June 5, three days before Apple’s closely watched developer conference (where this year the company unveiled a new iPhone and Mac laptops). But it was removed before the show; Johansen said that he was told that BART objected because it was too dark, blocking light from the stairway.

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