I think if you had multiple corpuses of lyrics, you could cross-check for anomalies of any variety (odd quoting, switching between american/british english), et

I think if you had multiple corpuses of lyrics, you could cross-check for anomalies of any variety (odd quoting, switching between american/british english), etc. The fingerprinting isn't likely applied to every song, to prevent obvious detection. If you went through multiple databases, you might see N prevailing copies of a song's lyrics, and 1 that seemed different. The one that's different has the anomaly.