Voice integration for the iPhone? Spotify's working on it. The streaming service's CEO Daniel Ek showed off a little "hack" his company has been working on, while proclaiming his passion for the 4S's sassy assistant Siri, telling his handset to serve up some Coldplay. The phone, naturally, obliged. No word yet on whether such a feature might work for groups not directly tied to Gwyneth Paltrow.