An iPad app of popular music streaming service Spotify is \"in the works,\" according to CEO Daniel Ek. That was his response as the question bubbled up during the announcement of a marketing deal with Coca-Cola on Wednesday. No details were revealed about the app, which tablet users have been eagerly awaiting. The current offering for the iPhone doesn\'t take full advantage of the features of the iPad. Spotify has been on a roll with announcements, some received better than others. In addition to the announcement that Coke is it, Spotify recently launched a play button for embedding across the Web and a listen button to artist pages on Facebook.