This one is one that I find useful. If you know some lyrics to a song but you don't actually know the song title or the artist, yet you wish to find out, then this is a good way to find out:
1) Go to a search engine (I tend to use Google)
2) Type in a line of lyrics (e.g. "strange what desire will make foolish people do")
3) Add the '+' symbol followed by the word 'lyrics'
so your search criteria now looks like ...
strange what desire will make foolish people do + lyrics
4) Click on search or press enter to get the results
Google Results from example above = Chris Isaak - Wicked Game
5) You should be able to go through the results and look at the lyrics to identify which song the lyrics are from; including the artist (note: some artists do covers so it may not be the exact version your looking for in which case I suggest using Shazam i.e. on my phone I call the number 2580 if I hear a song playing on TV or the Radio which I don't know and let it text me the artist and song title)
Hope this helps anyone who struggles :)