I was listening to the original song used as the opening for the first season of Hakuōki, and I realized that the tempo in the original was slower. I also listened to Vampire Knight's opening, and READY STEADY GO!, which was used as one of the openings for the original Fullmetal Alchemist anime, and they too had slower tempos than I originally thought.
I know that when a song is used as an opening for an anime, it gets cut down to about 1 minute (in most cases it's about 1/3 of the original). But does the song also get edited so it plays faster, or is this increase in tempo a result of the quality being dropped?