Today we are improving tagging a song/album/artist a lot with music streaming applications where music search is pivotal. I'm looking for a certain type of music which concerns the lyrics, so I'm wondering - is there an online service where I can list songs where they sing about a certain subject?
In some cases I know that there are genres like, for instance Christian music, Love songs, Gospel. But what about more niche lyrics such as Gambling, Zombies, Computer gaming, Vikings etc.
With Spotify, I can find a song where they sing about Superman, if I try to find similar songs or related artists I will find songs that sounds the same, but not many songs about Superman, Spriderman or any other super hero.
This questions is not only about software features, which is why I decided to ask it in the music QA. I'm wondering if there's a genre concept for this at all, or if I simply will need to try to find lyrics by word and then try to cherry-pick songs.