I'm not new to services like Shazam and SoundHound, but there are those times where I think "sheesh, these things are really good." So good that can whistle a song into a microphone and in seconds the top result shows: Take Five by Dave Brubeck. It's incredible really. Without them I'm left either giving it up hoping it will dawn upon me at a later date, or go mad searching through my iTunes thinking it had the word "man" in the title and fail miserably (I tried this and got 353 results). With a decent internet connection and the ability to sing/whistle/hum, the concept of having an unresolved tune in your head is becoming obsolete.
Thank you Soundcloud and thank you Dave Brubeck