If you're determined and have some time: 1) Note down the lyrics. 2) Google a line from the lyrics. If necessary try putting the line in quotes and adding the word "lyrics" after the closing quotes. 3) Very often the search results will return a website or two with the lyrics and the title. 4) From the title you can find details of various recordings. 5) Find the recordings on a site such as Amazon that has track preview samples. You can then check the preview to see if it's the version you downloaded.