Hi,
Everyone knows the app Shazam for mobile phones.
Here some alternatives to Shazam: http://alternativeto.net/software/shazam/
I see that there is no many apps for PC. So I try Tunatic. It found perfectly most of the songs where I played. It is very very small app and it is freeware.
Please make it portable.
Thank you!
Shazam has a Windows 8 version too: http://www.shazam.com/music/web/productfeatures.html?id=1368