Microsoft has been experimenting with different pricing models of late, such as the free-to-play MOBA Happy Wars. In another new twist, they've announced that a new Karaoke app will give players full access to over 8000 tracks... for as long as you're willing to pay.

According to the press release on PlayXBLA, the Karaoke app will feature a small selection of frequently-rotating trial songs, and will allow users to purchase time blocks of 1, 2, 6 or 24 hours. Songs will then be streamed directly from the servers, letting you to sing along using a USB microphone or headset. Avatars will dance around on a number of different stages, each of which can be decked out with various props and special items.

Smartglass support will ostensibly make for easy (and most importantly, quick) searching, alongside robust favourite and history lists.

The Karaoke app is set to release "in time for the holidays," and plans to challenge the traditional 'pay to keep' business model. Pricing hasn't been announced yet... so how much would you be willing to pay for an hour or two of Karaoke?