![Pandora + Rdio = Soundtrckr [PICS]](https://helios-i.mashable.com/imagery/archives/01fkuXidfrJycXiBpddzVSD/hero-image.fill.size_1248x702.v1647019608.jpg)
Soundtrckr, which launched a few months ago and had its official send-off recently, is a service for the desktop, iPhone [iTunes link], iPod touch, Windows Phone 7, Google Chrome and Nokia that marries music discovery with social and geolocation.
Once installing the free app on one's phone, a user has access to 10 million songs from indie and major labels (that's comparable with MOG's offering), as well as the ability to interact with friends.
Music subscription service Rdio's major selling point has been its social aspect, allowing users to follow friends and their listening habits. Soundtrckr kicks that feature up a notch -- allowing you to chat with friends in-app, share music on Facebook, Twitter and Foursquare, as well as check out stations created by folks in your vicinity.
Still, unlike Rdio, one is not privy to on-demand listening nor offline caching, which makes the service closer to Pandora or the current iteration of Slacker Radio (although Slacker does have offline listening) when it comes to music itself.
According to founder and CEO Daniele Calabrese, the service will soon be available in eight languages, as well as on Android, BlackBerry PlayBook and the HP TouchPad.
The iPhone app is a little on the crashy side (although the desktop version is super slick), but it's still a pretty fun way to discover/listen to music. Check out the gallery below for a closer look at the user interface -- which is rather clean and simple to navigate.