I remember there was a children's song on a cd that was a collection of songs for kids and one of the songs was a song about the human body and how blood pumps through it and the importance of blood in general. In addition to this, the singer was doing a Bela Lugosi impression of sorts and there were bat-like screeching sounds and maniacal laughter at the end.
It was a children's education/comedy song sung by someone who sounded a bit like Voltaire. Oh, and if it helps - the song in general is performed via harpsichord and/or pipe organ. The song was in English and it's an American song.
Kind of like this: https://www.youtube.com/watch?v=ZYKekg61EGw