Ooooh we love a bit of mystery! So when invitations from Google started landing on mats for an event tomorrow, our collective ears pricked up.
Word is that Google's planning on launching its music service then and that fits with screenshots which appear to show it running on a US HTC Inspire 4G.
The images show off several aspects of the service, including a free "song of the day" plus recommendations based on your audio history and a search function.
Prices appear to be on a par with the likes of Amazon and Apple music stores but there is the caveat that we don't know when this service is likely to hit these here shores. And given past experience with the murky world of digital rights and music licensing, we're not getting our hopes up until we hear something concrete.