It’s been a big week for Apple. CEO Steve Jobs returned to the spotlight Wednesday after a liver transplant, video cameras were added to an iPod nano for the first time ever, and now the iPhone App Store will feature a competing digital music service to iTunes: Real Networks’ Rhapsody. The app, available now at the App Store, is free for seven days; if users want to keep the service, they’ll need to pay $14.99 a month after that. However, Rhapsody officials say for that price, they’ll get instant access to more than 8 million songs.