I've been working on my music library and I've run into an issue concerning musical genres. While doing research into musical genres, I was struck that there doesn't seem to be an objective way to determine which genre a song belongs to. It seems that the genre the song belongs to depends on what you think it sounds like, if you think it sounds like a rock song then it's a rock song.
Then there's the confusion of songs that seems to be in multiple genres. An example of this is the album "Bach Meets The Beatles" by John Bayless, an album of Beatles songs done in the style of Johann Sebastian Bach. An example:
In this case would the song be classified as pop or rock because that was the genre of the original song or would it be classical because of what it sounds like?