What happens you know the lyrics of a song, but know the tune of it and would like to know which song it is?  Search engines will not be able to give you the result, if you dont know atleast few sentences of the song.  So, now if you are thinking your only hope is to hum it to your friends and asking them about the song, you are wrong.

There are many softwares/websites which does the thing.

1.   Midomi :   Midomi comes to your help if you know the tune of the song.  Just hum the tune and Midomi will tell you which song it is.  Midomi will display a list of matching songs after searching its database.  Its free to use online.  They have an application for iphone too , but with a price tag.

2.   AudioTag :   If you could record the song using your mobile phone or any other gadgets, AudioTag can search the song for you.  Simply upload a short audio clipping, or even the full song and it will try to identify the song.

3.   WatZatSong :   Its just as you thought; asking people whether they know what the song is.  You can upload a short mp3 file (it can be a recording in your own voice).  Members of the site will try to analyse the song and then suggest you the song name.

4.   Musipedia :   Search can be done by either playing it on a virtual piano keyboard or by humming through a microphone.

5.   Shazam :  Shazam is an application for mobile phones.  (iPhone, BlackBerry, Windows Mobile, Android, Nokia S60).  Install the application and hold your phone towards the source and Shazam will identify the song for you.

6.   FindMeATune :  You can search for the song if you know few lines of the song.  Key in the lyrics in the search bar and let FindMeATune find it for you.

7.   SongTapper :  Just use your computer keyboard to tap the rhythm of the song. It will help you find the name of the song