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Why does AmpJuke sometimes display the wrong lyrics (if any) ?
The functionality behind the [Lyrics] link next to each track, depends on what's configured, - visit this page for more information.
When you click on [Lyrics], a search is submitted, and the result(s) is/are shown in a new window.
Sometimes, the search might occasionally come up with a result that was not expected (you might have tried that sometimes before...), - f.ex. the lyrics you wanted for the song in question was not found or some other dubious result was retrieved.
In most cases a "good" result is shown (ie. the lyrics was really found for the song in question).