We've all suffered it. The agony of not being able to place a tune that's ringing in your head. Enter music identification apps. Hum into them on your PC or hold them up through your phone to a car radio and let them do the work. A guide to the top five

Soundhound
An ad supported service, Soundhound identifies the song you are humming. A top paid iPhone app, Soundhound has a more visual layout, and apart from letting you scan lyrics and read artist bios, it also lets you to identify songs from ambient background music and text-based search. You can listen to music through your own iTunes library or Pandora account. The best bit? You can capture FM radio, identify a song and create a Pandora Internet radio station within seconds.
Get it on www.soundhound.com. Available for: iPhone, Android, Nokia.