The idea here is to an option by sound. The feature should include something as follows
For e.g if you turn on the mic and play a song it should tell you who is the artist and title like shazam OR if your dog barks .. it should determine what kinda a animal it is.
Also if u hear some one speaking a strange language one should be able to search and find out what kind a language it was. Translating it to English voice or any language of one's choice will be a bonus . :)