I tried looking for "22" by Taylor Swift, song not found.
I guess not every song is in its database. "Human After All" by Daft Punk worked for me.
The 'Database' is just a youtube search with no visual video player, no?
Correct.
Not exactly; as mentioned in the About section, the database I'm using is actually Discogs: http://discogs.com/. YouTube is only used as a source of music.