Most of the apps on display in Macworld/iWorld 2013's "Appalooza" annex are of the productivity variety, but that doesn't mean there isn't some fun stuff to be found. One that caught my eye was Jam from Australian developer DreamWalk Mobile.
Launched two weeks ago on the App Store, it's a free music-creation app for iPhone and iPod touch with a unique hook: You sing -- not even especially well, even -- and the app auto-tunes you and creates an original backing track, then mixes it all down into something you can share on Facebook.
The app, which has seen about 19,000 songs shared to date, came from the developer's desire to take an