Shazam, the popular music identifier service that will be integrated into Siri this fall with iOS 8, has received an update today for iOS that brings a major new feature. Shazam has essentially turned its app into a streaming music service of sort by integrating deeply with Rdio. Now, if you tag a song using Shazam, you can listen to the complete song via Rdio right within the Shazam app. In our brief testing today, the functionality seems to work well. You do need the Rdio app installed and an Rdio account.