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.