If you don't quite get along with Spotify, even with its impressive new iPad app, then you might want to give Rdio a try.You can give it a try too, as there's a free trial on offer. The service has been doing pretty well in the US since 2010. But with Spotify now making a lot of the headlines in that country now, Rdio obviously wants to try its luck elsewhere too.It's not a million miles away from Spotify in truth, especially when it comes to look, feel and playlists, which you can share with your fellow Rdio-loving friends. You can also sync between your computer and phone. Yes, just like Spotify. The obvious difference is the music. Like all these music streaming services, different sites have different rights in place - and Rdio is no exception. You'll find some artists that aren't really represented on Spotify, but right now, a number where the coverage is less. That's where the free trial comes in.You can sign up at the website to try out Rdio with a free seven-day trial, that's one without giving over your credit card details too. If you like it, you can sign up for a £4.99 monthly deal if you just want to use your web browser of if you want to use the mobile apps, you'll be looking at £9.99 each month. Basically, a similar price structure to Spotify.As for going mobile, there are iPhone and iPad apps, as well as apps for Windows Phone, BlackBerry and Android. That should cover most smartphone users.