Bay Area app developer Smule has amassed an army of mobile instruments, but really, what fun are all those music makers without a little good old-fashioned jamming? Today, the company's offering up the simply named Guitar, an app that lets you strum along to songs recorded through its equally straightforwardly named Sing. At present, the company has hand-picked a dozen or so singers, letting you play along (though expect that number to increase, as time goes on), becoming "the first pair of [Smule] apps that actually talk to each other," according to the company.
Using the app will be pretty intuitive for anyone who's messed around with Guitar Hero and its ilk, letting you know when to strum via swipe through a dynamically scrolling layout. On more advanced modes, you can choose the chord you want to play, but in Easy, it'll just do it for you. You can pick a single string with a tap and add vibrato by shaking your iPhone / iPad. We got a preview of the app during a recent visit to the Smule office for the Engadget Show, back when it went under the (arguably superior) name "Strum." Check out video of that and the final version after the break.