It might help, it might not. Right now it's relatively new and mostly Vocaloid songs for I all can see.

http://songle.jp/

"Songle is a web service for active music listening that facilitates a deeper understanding of music and enriches your music listening experience. Songle utilizes music-understanding technologies that automatically estimate music scene descriptions and enable visualizations such as structural segments, hierarchical beat structure, melody line, and chords. All users accessing the Songle service can correct estimation errors."