You can download the update directly on your device through the Windows Phone Store or by using the link which follows:
Press the Search button on your Lumia phone, tap Vision and then scan the following barcode by pointing your device camera toward it.
Shazam for Windows Phone version 2.3.0 has the following new features and improvements
- With free and unlimited tagging, use Shazam as much as you like
- Share tags on Windows Live, Facebook, Twitter & more
- Discover new music with the Shazam Tag Chart
- Top Local Tags: See the most popular tags in your area
- Improved UI