Today I used the Merlin Bird ID App for identifying bird sounds around me and most of the time it worked great, even if there are several birds calling at the same time it is able to identify the birds by their sounds with great accuracy. I was really amazed by the results and the app helped me a lot in identifying several birds today. I can definitely recommend this App for everyone who is interested in Birding.
https://play.google.com/store/apps/details?id=com.labs.merlinbirdid.app