Music subscription and discovery service Rdio is now available in Norway, the company yesterday unceremoniously announced on its Twitter account (but not its blog). Rdio is now available in 4 Nordic countries, having previously launched in Denmark, Finland and chief competitor Spotify‘s home turf Sweden.

It’s also available to users in a number of other European countries, including Germany, Spain, Portugal, France and the UK.

Launched in August 2010, Rdio is a digital music service that provides access to an on-demand catalog spanning over 18 million licensed songs, which are available for streaming and/or downloading.

Rdio works in a browser but also offers apps for desktops and phones running Android, BlackBerry, Windows Phone and iOS.

Rdio also works well with Sonos and Roku systems.

In the US and Canada, ‘Rdio Unlimited’ costs $9.99 per month, supporting Web, mobile and media player use. ‘Rdio Web’ costs $4.99 per month, and supports Web use only. For local pricing, go here.

Rdio recently launched ‘protected accounts’ after rolling out a totally revamped experience in May.

The company is headquartered in San Francisco and was founded by Janus Friis, one of the creators of Skype. Rdio is backed by both Friis personally and Skype, as well as by Atomico and Mangrove Capital Partners.

I’ve only found a handful of tweets of Norwegians talking about Rdio’s debut in their country, and they weren’t all that positive:

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