Megaupload bolstered its legal case against the recording industry for forcing YouTube to remove the company’s all-star promotional video, arguing that a copyright takedown notice was bogus since it had secured the signature of Black Eyed Peas front man will.i.am to appear in a video singing the file-sharing service’s praises.

The Hong Kong-based file-sharing service lodged the contract (.pdf) in federal court Wednesday as proof it had the right to include will.i.am singing, “When I’ve got to send files across the globe, I use Megaupload.”

The four-minute video featuring will.i.am and a host of...

When musicians first laid eyes on the iPad, they immediately recognized its huge potential as a music-making machine. The versatility of the touchscreen quickly gave rise to a bevy of synths, drum machines, multitrack recording apps and otherworldly, touch-sensitive instruments.

And while making music on the iPad is still mostly about the apps -- Animoog, Korg iElectribe, NodeBeat, GarageBand, Sunrizer, JazzMutant Lemur -- the tablet becomes even more useful if you can plug other stuff into it.

At first, we only had the ability to plug in guitars and microphones to record songs. But now, ever...